Refine your search
2 vulnerabilities found for by showdownjs
CVE-2026-104477 (GCVE-0-2026-104477)
Vulnerability from cvelistv5
Published
2026-10-02 23:28
Modified
2026-10-05 20:30
Severity ?
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
VLAI Severity ?
EPSS score ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or onmouseover handlers to execute script when victims view rendered HTML.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| showdownjs | showdown |
Version: 0 ≤ 2.1.0 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-104477",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-05T19:42:32.208544Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-05T20:30:14.007Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/showdown",
"product": "showdown",
"vendor": "showdownjs",
"versions": [
{
"lessThanOrEqual": "2.1.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:showdownjs:showdown:*:*:*:*:*:*:*:*",
"versionEndIncluding": "2.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Muhammad Sobirov"
}
],
"datePublic": "2026-06-27T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or onmouseover handlers to execute script when victims view rendered HTML."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "PASSIVE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW"
},
"format": "CVSS"
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-02T23:28:47.414Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"name": "Patch Commit",
"tags": [
"patch"
],
"url": "https://github.com/showdownjs/showdown/commit/4fb992cd26631c108ec0410342630c80207ec7c6"
},
{
"tags": [
"product"
],
"url": "https://github.com/showdownjs/showdown"
},
{
"name": "VulnCheck Advisory: Showdown through 2.1.0 XSS via unescaped quote in href and src attributes",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/showdown-through-2.1.0-xss-via-unescaped-quote-in-href-and-src-attributes"
}
],
"title": "Showdown through 2.1.0 XSS via unescaped quote in href and src attributes",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-104477",
"datePublished": "2026-10-02T23:28:47.414Z",
"dateReserved": "2026-10-02T00:55:58.388Z",
"dateUpdated": "2026-10-05T20:30:14.007Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2024-1899 (GCVE-0-2024-1899)
Vulnerability from cvelistv5
Published
2024-02-26 18:45
Modified
2024-08-01 18:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Showdownjs | Showdown |
Version: 0 < |
{
"containers": {
"adp": [
{
"affected": [
{
"cpes": [
"cpe:2.3:a:showdownjs:showdown:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "showdown",
"vendor": "showdownjs",
"versions": [
{
"lessThanOrEqual": "2.1.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-1899",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-02-27T15:00:09.096812Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-674",
"description": "CWE-674 Uncontrolled Recursion",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-07-26T17:55:01.319Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-01T18:56:22.277Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://www.tenable.com/security/research/tra-2024-05"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Showdown",
"repo": "https://github.com/showdownjs/showdown",
"vendor": "Showdownjs",
"versions": [
{
"lessThanOrEqual": "2.1.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eAn issue in the anchors subparser of Showdownjs versions \u0026lt;= 2.1.0 could allow a remote attacker to cause denial of service conditions.\u003c/span\u003e\u003cbr\u003e"
}
],
"value": "An issue in the anchors subparser of Showdownjs versions \u003c= 2.1.0 could allow a remote attacker to cause denial of service conditions.\n"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-02-26T18:45:23.289Z",
"orgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
"shortName": "tenable"
},
"references": [
{
"url": "https://www.tenable.com/security/research/tra-2024-05"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Showdownjs Denial of Service",
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
}
},
"cveMetadata": {
"assignerOrgId": "5ac1ecc2-367a-4d16-a0b2-35d495ddd0be",
"assignerShortName": "tenable",
"cveId": "CVE-2024-1899",
"datePublished": "2024-02-26T18:45:23.289Z",
"dateReserved": "2024-02-26T18:20:18.142Z",
"dateUpdated": "2024-08-01T18:56:22.277Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}