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27 vulnerabilities found for mybb by mybb
CVE-2026-45118 (GCVE-0-2026-45118)
Vulnerability from cvelistv5
Published
2026-08-18 15:55
Modified
2026-08-18 17:52
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-83 - Improper Neutralization of Script in Attributes in a Web Page
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Contact module does not validate a redirect URL or protocol correctly, resulting in an open redirect and reflected JavaScript code injection. contact.php accepts the redirect target from the from HTTP parameter in $mybb->input['from'] or the Referer HTTP header in $_SERVER['HTTP_REFERER'] and passes it to redirect() without sufficient verification. A javascript: URI becomes the target of the `Click here if you don't want to wait any longer` link because $force_redirect is true, allowing script execution when a victim selects the link. This issue is fixed in version 1.8.40.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
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},
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}
],
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"timestamp": "2026-08-18T17:47:24.986811Z",
"version": "2.0.3"
},
"type": "ssvc"
}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"product": "mybb",
"vendor": "mybb",
"versions": [
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"version": "\u003c 1.8.40"
}
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],
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"value": "MyBB is free and open source forum software. Prior to 1.8.40, the Contact module does not validate a redirect URL or protocol correctly, resulting in an open redirect and reflected JavaScript code injection. contact.php accepts the redirect target from the from HTTP parameter in $mybb-\u003einput[\u0027from\u0027] or the Referer HTTP header in $_SERVER[\u0027HTTP_REFERER\u0027] and passes it to redirect() without sufficient verification. A javascript: URI becomes the target of the `Click here if you don\u0027t want to wait any longer` link because $force_redirect is true, allowing script execution when a victim selects the link. This issue is fixed in version 1.8.40."
}
],
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"attackVector": "NETWORK",
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"baseScore": 9.3,
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
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{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-wf92-5q5h-qr53",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-wf92-5q5h-qr53"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-wf92-5q5h-qr53",
"discovery": "UNKNOWN"
},
"title": "MyBB: Contact page reflected XSS"
}
},
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CVE-2026-45117 (GCVE-0-2026-45117)
Vulnerability from cvelistv5
Published
2026-08-18 15:53
Modified
2026-08-18 18:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Summary
MyBB is free and open source forum software. From 1.8.13 until 1.8.40, the installer module does not properly escape user-supplied database configuration values written to the configuration file, resulting in PHP code injection and remote code execution when the installer is available. install/index.php processes the values with addcslashes(), but the $characters argument added in MyBB 1.8.13 does not include the backslash character, allowing crafted input to escape the generated PHP string. The uniquely identifying implementation details include introduced in MyBB 1.8.13. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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},
{
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}
],
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"timestamp": "2026-08-18T18:58:15.297297Z",
"version": "2.0.3"
},
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}
],
"metrics": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
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"baseScore": 9.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"scope": "UNCHANGED",
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}
}
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"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-gpc4-77rp-3xqr",
"tags": [
"x_refsource_CONFIRM"
],
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},
{
"name": "https://github.com/mybb/mybb/commit/0fe713e3b964bfc878ea65bdd9f746f585f6ebbf",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/0fe713e3b964bfc878ea65bdd9f746f585f6ebbf"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-gpc4-77rp-3xqr",
"discovery": "UNKNOWN"
},
"title": "MyBB: Installer database configuration RCE"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45117",
"datePublished": "2026-08-18T15:53:29.914Z",
"dateReserved": "2026-05-08T20:08:17.207Z",
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"state": "PUBLISHED"
},
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}
CVE-2026-45129 (GCVE-0-2026-45129)
Vulnerability from cvelistv5
Published
2026-08-18 15:53
Modified
2026-08-18 18:57
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Recovery Codes module does not validate requests correctly, allowing same-site attackers to rotate a victim administrator's recovery codes with a specially crafted URL. The Admin CP Home, Preferences, Recovery Codes action=recovery_codes page regenerates Two-Factor Authentication recovery codes in mybb_adminoptions.recovery_codes on GET requests without request forgery protection. The uniquely identifying implementation details include admin/modules/home/preferences.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T18:57:37.690351Z",
"version": "2.0.3"
},
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}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"vendor": "mybb",
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"status": "affected",
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}
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],
"descriptions": [
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"value": "MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Recovery Codes module does not validate requests correctly, allowing same-site attackers to rotate a victim administrator\u0027s recovery codes with a specially crafted URL. The Admin CP Home, Preferences, Recovery Codes action=recovery_codes page regenerates Two-Factor Authentication recovery codes in mybb_adminoptions.recovery_codes on GET requests without request forgery protection. The uniquely identifying implementation details include admin/modules/home/preferences.php. This issue is fixed in version 1.8.40."
}
],
"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L",
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],
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},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-75vg-6wgp-mcc9",
"discovery": "UNKNOWN"
},
"title": "MyBB: ACP Recovery Codes CSRF"
}
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"dateReserved": "2026-05-08T20:08:17.209Z",
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"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}
CVE-2026-45124 (GCVE-0-2026-45124)
Vulnerability from cvelistv5
Published
2026-08-18 15:52
Modified
2026-08-19 14:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-862 - Missing Authorization
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Mod CP Report Center does not check permissions consistently, allowing moderators without report-management permission to mark reports as resolved. The modcp.php?action=do_reports Mark Selected as Read handler is reachable with canmodcp even without canmanagereportedcontent or canmanagereportedposts. When no forums are in scope, $flist_reports is empty and the UPDATE mybb_reportedcontent query executes without the expected permission-based limitation. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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}
],
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"timestamp": "2026-08-19T14:45:20.417443Z",
"version": "2.0.3"
},
"type": "ssvc"
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"shortName": "CISA-ADP"
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}
],
"metrics": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
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"name": "https://github.com/mybb/mybb/commit/5cda5f6d183bc2cac24f0533e8d3060a9a46cc42",
"tags": [
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"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
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"source": {
"advisory": "GHSA-gfxj-g7w6-6w4v",
"discovery": "UNKNOWN"
},
"title": "MyBB: Mod CP report resolution missing authorization"
}
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"dateUpdated": "2026-08-19T14:45:32.486Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-45120 (GCVE-0-2026-45120)
Vulnerability from cvelistv5
Published
2026-08-18 15:52
Modified
2026-08-18 17:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not verify private event status consistently, allowing users with viewing and moderation permissions to access and moderate private events. The private-event check used by get_events() in inc/functions_calendar.php and the event action is missing from the remaining calendar.php actions, despite the limited-access behavior described in inc/languages/english/calendar.lang.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T17:19:13.557606Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"product": "mybb",
"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
],
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"lang": "en",
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}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
}
}
],
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CVE-2026-47245 (GCVE-0-2026-47245)
Vulnerability from cvelistv5
Published
2026-08-18 15:51
Modified
2026-08-18 17:37
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-252 - Unchecked Return Value
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the User CP Buddy/Ignore List component does not validate reciprocal buddy-list updates correctly. The usercp.php?action=do_editlists delete handler removes the selected entry from the acting user's list and then updates mybb_users.buddylist for the target account. The reciprocal update searches for the deleted target UID instead of the acting user's UID and uses the unchecked array_search() return value as an array key. A false result can be converted to index 0, removing the target account's first stored buddy while leaving the actual reciprocal entry unchanged. The uniquely identifying implementation details include false converted to index 0. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45734 (GCVE-0-2026-45734)
Vulnerability from cvelistv5
Published
2026-08-18 15:51
Modified
2026-08-19 14:43
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-837 - Improper Enforcement of a Single, Unique Action
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the built-in CAPTCHA does not consistently enforce single-use semantics, allowing remote attackers to bypass CAPTCHA controls through challenge replay. The successful validation paths in contact.php, member.php?action=do_resendactivation, member.php?action=do_lostpw, member.php?action=do_emailuser, and sendthread.php?action=do_sendtofriend do not call captcha::invalidate_captcha() for the MyBB Default CAPTCHA selected by the captchaimage setting. A valid response can therefore be reused until a non-vulnerable endpoint invalidates it, an incorrect response is submitted, or the challenge expires. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45125 (GCVE-0-2026-45125)
Vulnerability from cvelistv5
Published
2026-08-18 15:50
Modified
2026-08-18 17:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize sender names correctly, resulting in mail header injection. member.php?action=do_emailuser accepts the fromname HTTP parameter for guests or the stored username for authenticated users when the cansendemail group permission is enabled. When mail_handler is set to the default PHP mail value, the sender name is used without sanitization in Return-Path and Reply-To headers, allowing arbitrary headers to be injected with CRLF sequences. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45122 (GCVE-0-2026-45122)
Vulnerability from cvelistv5
Published
2026-08-18 15:50
Modified
2026-08-18 17:54
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-863 - Incorrect Authorization
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not validate moderation permissions for the destination calendar when moving events. A user with moderation permission for the source calendar can move an event to a calendar where the user has only viewing permission because the do_move action in calendar.php does not check canmoderateevents for the target calendar. The uniquely identifying implementation details include calendar event move, source calendar moderation permission, and destination calendar viewing permission. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45119 (GCVE-0-2026-45119)
Vulnerability from cvelistv5
Published
2026-08-18 15:49
Modified
2026-08-19 14:41
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP UTF-8 Conversion module does not validate certain requests correctly, allowing same-site attackers to alter table encoding and deny service with a specially crafted URL. The do=all control flow in admin/modules/tools/system_health.php performs ALTER TABLE operations, column rewrite phases, and fulltext index rebuilds on GET requests for the database table named by the table parameter without request verification. The uniquely identifying implementation details include GET requests without request verification. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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"content": {
"id": "CVE-2026-45119",
"options": [
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-19T14:40:56.896930Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T14:41:09.985Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "mybb",
"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP UTF-8 Conversion module does not validate certain requests correctly, allowing same-site attackers to alter table encoding and deny service with a specially crafted URL. The do=all control flow in admin/modules/tools/system_health.php performs ALTER TABLE operations, column rewrite phases, and fulltext index rebuilds on GET requests for the database table named by the table parameter without request verification. The uniquely identifying implementation details include GET requests without request verification. This issue is fixed in version 1.8.40."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
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"description": "CWE-352: Cross-Site Request Forgery (CSRF)",
"lang": "en",
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}
],
"providerMetadata": {
"dateUpdated": "2026-08-18T15:49:14.763Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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},
"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-p48q-4vgf-q7x8",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-p48q-4vgf-q7x8"
},
{
"name": "https://github.com/mybb/mybb/commit/70d445d14c8350cc014be66f7874611abef70ab4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/70d445d14c8350cc014be66f7874611abef70ab4"
},
{
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"tags": [
"x_refsource_MISC"
],
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},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-p48q-4vgf-q7x8",
"discovery": "UNKNOWN"
},
"title": "MyBB: ACP UTF-8 Conversion CSRF"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45119",
"datePublished": "2026-08-18T15:49:14.763Z",
"dateReserved": "2026-05-08T20:08:17.207Z",
"dateUpdated": "2026-08-19T14:41:09.985Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}
CVE-2026-45126 (GCVE-0-2026-45126)
Vulnerability from cvelistv5
Published
2026-08-18 15:47
Modified
2026-08-18 18:02
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Security Questions module does not validate the anti-CSRF token correctly, allowing same-site attackers to enable or disable registration challenge questions with a specially crafted URL. The controller processes GET requests for the disable and enable actions to modify mybb_questions.active without verifying the my_post_key token attached by the user interface. The uniquely identifying implementation details include admin/modules/config/questions.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
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"id": "CVE-2026-45126",
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{
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},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T18:00:33.448166Z",
"version": "2.0.3"
},
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
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{
"lang": "en",
"value": "MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Security Questions module does not validate the anti-CSRF token correctly, allowing same-site attackers to enable or disable registration challenge questions with a specially crafted URL. The controller processes GET requests for the disable and enable actions to modify mybb_questions.active without verifying the my_post_key token attached by the user interface. The uniquely identifying implementation details include admin/modules/config/questions.php. This issue is fixed in version 1.8.40."
}
],
"metrics": [
{
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.5,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
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"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-m42q-vgx3-fqcc",
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"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-m42q-vgx3-fqcc"
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{
"name": "https://github.com/mybb/mybb/commit/6893b395c7fa3b9e4de6235caea0ce198c376c4f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/6893b395c7fa3b9e4de6235caea0ce198c376c4f"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-m42q-vgx3-fqcc",
"discovery": "UNKNOWN"
},
"title": "MyBB: ACP Questions state CSRF"
}
},
"cveMetadata": {
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"assignerShortName": "GitHub_M",
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"datePublished": "2026-08-18T15:47:09.205Z",
"dateReserved": "2026-05-08T20:08:17.208Z",
"dateUpdated": "2026-08-18T18:02:06.736Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-45116 (GCVE-0-2026-45116)
Vulnerability from cvelistv5
Published
2026-08-18 15:46
Modified
2026-08-18 17:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the user datahandler does not properly validate checkbox and multiselect profile field types, resulting in stored JavaScript code injection. UserDataHandler::verify_profile_fields() only performs the specialized validation when is_array($profile_fields[$field]) is true. A non-array profile_fields[fidX] value instead of the expected profile_fields[fidX][] shape falls through to generic text handling and is stored without verification. The affected value is then rendered directly by member.php and inc/functions_post.php rather than processed by the MyCode parser. The uniquely identifying implementation details include inc/datahandlers/user.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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"adp": [
{
"metrics": [
{
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"content": {
"id": "CVE-2026-45116",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T17:55:09.371549Z",
"version": "2.0.3"
},
"type": "ssvc"
}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
],
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"vendor": "mybb",
"versions": [
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"status": "affected",
"version": "\u003c 1.8.40"
}
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}
],
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"lang": "en",
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}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N",
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},
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{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-4p6g-p3qh-559v",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-4p6g-p3qh-559v"
},
{
"name": "https://github.com/mybb/mybb/commit/c32f0c22baab704a68b8d58fcdd2f26fadbbe19b",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/c32f0c22baab704a68b8d58fcdd2f26fadbbe19b"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-4p6g-p3qh-559v",
"discovery": "UNKNOWN"
},
"title": "MyBB: Profile field type confusion XSS"
}
},
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"assignerShortName": "GitHub_M",
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"dateUpdated": "2026-08-18T17:55:31.261Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-45115 (GCVE-0-2026-45115)
Vulnerability from cvelistv5
Published
2026-08-18 15:46
Modified
2026-08-18 17:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Buddy/Ignore component does not sanitize usernames correctly, allowing attackers to perform JavaScript code injection through a specially crafted username. The User CP Buddy/Ignore list and the Select Buddies list in Private Messages pass usernames through htmlspecialchars_uni(), which may leave single quotes unescaped. The payload is triggered when a victim chooses Yes in Please Confirm while removing the username in usercp.php, or selects the username through the onclick handler in the xmlhttp.php Select Buddies popup. The uniquely identifying implementation details include Private Messages Select Buddies list, and unescaped single quotes. This issue is fixed in version 1.8.40.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
{
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{
"metrics": [
{
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"id": "CVE-2026-45115",
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{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T17:55:15.036117Z",
"version": "2.0.3"
},
"type": "ssvc"
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"dateUpdated": "2026-08-18T17:55:22.351Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"vendor": "mybb",
"versions": [
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"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
],
"descriptions": [
{
"lang": "en",
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}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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},
"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-p766-qqxv-rfc2",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-p766-qqxv-rfc2"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-p766-qqxv-rfc2",
"discovery": "UNKNOWN"
},
"title": "MyBB: Buddy/ignore list username XSS"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
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"dateUpdated": "2026-08-18T17:55:22.351Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-45121 (GCVE-0-2026-45121)
Vulnerability from cvelistv5
Published
2026-08-18 15:45
Modified
2026-08-18 18:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-863 - Incorrect Authorization
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not check permissions consistently when listing calendars, allowing authenticated users to access titles of calendars that are otherwise inaccessible. The affected calendar-selection paths in calendar.php perform permission checks against an invalid calendar context before returning calendar titles. The uniquely identifying implementation details include titles of inaccessible calendars, and invalid calendar permission context. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"containers": {
"adp": [
{
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{
"other": {
"content": {
"id": "CVE-2026-45121",
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{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T18:50:05.374697Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
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],
"cna": {
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"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
],
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"lang": "en",
"value": "MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not check permissions consistently when listing calendars, allowing authenticated users to access titles of calendars that are otherwise inaccessible. The affected calendar-selection paths in calendar.php perform permission checks against an invalid calendar context before returning calendar titles. The uniquely identifying implementation details include titles of inaccessible calendars, and invalid calendar permission context. This issue is fixed in version 1.8.40."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
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],
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"description": "CWE-863: Incorrect Authorization",
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]
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],
"providerMetadata": {
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],
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"url": "https://github.com/mybb/mybb/commit/78e07fea34a6f6c326e668526bfb8e451c19e966"
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CVE-2026-46482 (GCVE-0-2026-46482)
Vulnerability from cvelistv5
Published
2026-08-18 15:44
Modified
2026-08-18 17:46
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Summary
### Impact
The registration component does not validate the text-based _Security Question_ CAPTCHA correctly, allowing attackers to bypass the challenge via a specially crafted value.
[CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
### Details
The public _Registration_ workflow ([`member.php?action=do_register`](https://github.com/mybb/mybb/blob/mybb_1839/member.php#L262-L307)) accepts a hidden field `question_id` — expected to match the question session identifier (`mybb_questionsessions.sid`) — and validates the challenge answer without a fail-closed fallback for invalid identifiers. If the value is blank, forged, or expired, the request continues without a question-related error.
### Patches
MyBB 1.8.(...) resolves this issue with the following changes:
- Commit: https://github.com/mybb/mybb/commit/
- `.patch`: https://github.com/mybb/mybb/commit/.patch
### References
- Release Notes: https://mybb.com/versions/1.8.(...)/
### For more information
Go to [mybb.com/security](https://mybb.com/security/) to report possible security concerns or to learn more about security research at MyBB.
### Contact
The security team can be reached at [security@mybb.com](mailto:security@mybb.com).
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45123 (GCVE-0-2026-45123)
Vulnerability from cvelistv5
Published
2026-08-18 15:44
Modified
2026-08-18 18:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the remote requests feature does not correctly handle IPv6 addresses, resulting in a server-side request forgery vulnerability. The default disallowed remote hosts list does not include IPv6 addresses. Verification in fetch_remote_file() fails open when get_ip_by_hostname() returns no result because that function does not return IPv6 results, allowing a crafted remote target to bypass the host restriction. The uniquely identifying implementation details include fail-open verification, and inc/functions.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-45128 (GCVE-0-2026-45128)
Vulnerability from cvelistv5
Published
2026-08-18 15:43
Modified
2026-08-18 17:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator's default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users & Groups, Users, View Manager changes the administrator's default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Users → View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2026-45127 (GCVE-0-2026-45127)
Vulnerability from cvelistv5
Published
2026-08-18 15:38
Modified
2026-08-19 14:39
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the ACP Mass Mail module does not validate certain requests correctly, allowing same-site attackers to create draft entries from archived entries by embedding a specially crafted URL. The Resend route in Admin CP, Users & Groups, Mass Mail, Mass Mailing Archive duplicates archived mailing entries into new drafts with mybb_massemails.status set to 0 on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Mass Mail → Mass Mailing Archive, mybb_massemails.status = 0, and admin/modules/user/mass_mail.php. This issue is fixed in version 1.8.40.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2023-53979 (GCVE-0-2023-53979)
Vulnerability from cvelistv5
Published
2025-12-22 21:35
Modified
2026-03-05 12:03
Severity ?
8.6 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Summary
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.
References
| URL | Tags | |||||||||||||
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CVE-2025-48941 (GCVE-0-2025-48941)
Vulnerability from cvelistv5
Published
2025-06-02 15:58
Modified
2025-06-02 16:07
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1230 - Exposure of Sensitive Information Through Metadata
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the search component does not validate permissions correctly, which allows attackers to determine the existence of hidden (draft, unapproved, or soft-deleted) threads containing specified text in the title. The visibility state (`mybb_threads.visible` integer column) of threads is not validated in internal search queries, whose result is used to output a general success or failure of the search. While MyBB validates permissions when displaying the final search results, a search operation that internally produces at least one result outputs a redirect response (as a HTTP redirect, or a success message page with delayed redirect, depending on configuration). On the other hand, a search operation that internally produces no results outputs a corresponding message in the response without a redirect. This allows a user to determine whether threads matching title search parameters exist, including draft threads (`visible` with a value of `-2`), soft-deleted threads (`visible` with a value of `-1`), and unapproved threads (`visible` with a value of `0`); in addition to displaying generally visible threads (`visible` with a value of `1`). This vulnerability does not affect other layers of permissions. In order to exploit the vulnerability, the user must have access to the search functionality, and general access to forums containing the thread(s). The vulnerability does not expose the message content of posts. MyBB 1.8.39 resolves this issue.
References
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CVE-2025-48940 (GCVE-0-2025-48940)
Vulnerability from cvelistv5
Published
2025-06-02 15:52
Modified
2025-06-02 16:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the upgrade component does not validate user input properly, which allows attackers to perform local file inclusion (LFI) via a specially crafted parameter value. In order to exploit the vulnerability, the installer must be unlocked (no `install/lock` file present) and the upgrade script must be accessible (by re-installing the forum via access to `install/index.php`; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.
References
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CVE-2024-23335 (GCVE-0-2024-23335)
Vulnerability from cvelistv5
Published
2024-05-01 06:27
Modified
2024-08-01 22:59
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-20 - Improper Input Validation
Summary
MyBB is a free and open source forum software. The backup management module of the Admin CP may accept `.htaccess` as the name of the backup file to be deleted, which may expose the stored backup files over HTTP on Apache servers. MyBB 1.8.38 resolves this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability
References
| URL | Tags | ||||||||||
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CVE-2024-23336 (GCVE-0-2024-23336)
Vulnerability from cvelistv5
Published
2024-05-01 06:27
Modified
2024-08-01 22:59
Severity ?
VLAI Severity ?
EPSS score ?
Summary
MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
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"x_transferred"
],
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{
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"x_refsource_MISC",
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"x_refsource_MISC",
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{
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{
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{
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{
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{
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"x_refsource_MISC"
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{
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CVE-2023-46251 (GCVE-0-2023-46251)
Vulnerability from cvelistv5
Published
2023-11-06 17:41
Modified
2024-09-04 19:32
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
MyBB is a free and open source forum software. Custom MyCode (BBCode) for the visual editor (_SCEditor_) doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. This weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. The impact is be mitigated when: 1. the visual editor is disabled globally (_Admin CP → Configuration → Settings → Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), or 2. the visual editor is disabled for individual user accounts (_User CP → Your Profile → Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked). MyBB 1.8.37 resolves this issue with the commit `6dcaf0b4d`. Users are advised to upgrade. Users unable to upgrade may mitigate the impact without upgrading MyBB by changing the following setting (_Admin CP → Configuration → Settings_):
- _Clickable Smilies and BB Code → [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. Similarly, individual MyBB forum users are able to disable the visual editor by diabling the account option (_User CP → Your Profile → Edit Options_) _Show the MyCode formatting options on the posting pages_.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
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{
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"cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*"
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"vendor": "mybb",
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"status": "affected",
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"lang": "en",
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{
"name": "https://mybb.com/versions/1.8.37/",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.37/"
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],
"source": {
"advisory": "GHSA-wj33-q7vj-9fr8",
"discovery": "UNKNOWN"
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"title": "Visual editor persistent Cross-site Scripting (XSS) in MyBB"
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},
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"dateReserved": "2023-10-19T20:34:00.948Z",
"dateUpdated": "2024-09-04T19:32:41.984Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
CVE-2022-39265 (GCVE-0-2022-39265)
Vulnerability from cvelistv5
Published
2022-10-06 00:00
Modified
2025-04-22 17:19
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Summary
MyBB is a free and open source forum software. The _Mail Settings_ → Additional Parameters for PHP's mail() function mail_parameters setting value, in connection with the configured mail program's options and behavior, may allow access to sensitive information and Remote Code Execution (RCE). The vulnerable module requires Admin CP access with the `_Can manage settings?_` permission and may depend on configured file permissions. MyBB 1.8.31 resolves this issue with the commit `0cd318136a`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
References
{
"containers": {
"adp": [
{
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"dateUpdated": "2024-08-03T12:00:43.494Z",
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{
"tags": [
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"url": "https://github.com/mybb/mybb/security/advisories/GHSA-hxhm-rq9f-7xj7"
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{
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"url": "https://mybb.com/versions/1.8.31/"
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],
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},
{
"metrics": [
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CVE-2022-24734 (GCVE-0-2022-24734)
Vulnerability from cvelistv5
Published
2022-03-09 21:25
Modified
2025-04-22 18:19
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Summary
MyBB is a free and open source forum software. In affected versions the Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type `php` with PHP code, executed on on _Change Settings_ pages. This results in a Remote Code Execution (RCE) vulnerability. The vulnerable module requires Admin CP access with the `Can manage settings?` permission. MyBB's Settings module, which allows administrators to add, edit, and delete non-default settings, stores setting data in an options code string ($options_code; mybb_settings.optionscode database column) that identifies the setting type and its options, separated by a new line character (\n). In MyBB 1.2.0, support for setting type php was added, for which the remaining part of the options code is PHP code executed on Change Settings pages (reserved for plugins and internal use). MyBB 1.8.30 resolves this issue. There are no known workarounds.
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
{
"containers": {
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},
"references": [
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
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{
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},
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"x_refsource_MISC",
"x_transferred"
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},
{
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CVE-2020-15139 (GCVE-0-2020-15139)
Vulnerability from cvelistv5
Published
2020-08-10 21:35
Modified
2024-08-04 13:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file.
References
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