CVE-2026-62856 (GCVE-0-2026-62856)
Vulnerability from cvelistv5 – Published: 2026-11-06 17:00 – Updated: 2026-11-09 22:45
VLAI
EPSS
VEX
Title
FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection in Polycast Channel Query
Summary
FreeScout is a self-hosted help desk and shared mailbox application. Prior to version 1.8.226, the polycast/receive endpoint fails to escape SQL LIKE wildcards in supplied channel names, while channel authorization applies only to names with specific prefixes. An unauthenticated attacker with a guest session and valid CSRF token can submit a wildcard channel name to retrieve matching notification events intended for other users. Notification payload generation lacks a corresponding access check, exposing conversation message content, identifiers, URLs, and notification HTML across users and mailboxes. This issue is fixed in version 1.8.226.
Severity
7.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 22:34 UTC
CWE
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/freescout-help-desk/freescout/… | x_refsource_CONFIRM |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| freescout-help-desk | freescout |
Affected:
< 1.8.226
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-62856",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-09T22:34:46.799115Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-11-09T22:45:12.686Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "freescout",
"vendor": "freescout-help-desk",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.226"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "FreeScout is a self-hosted help desk and shared mailbox application. Prior to version 1.8.226, the \u00a0polycast/receive\u00a0 endpoint fails to escape SQL LIKE wildcards in supplied channel names, while channel authorization applies only to names with specific prefixes. An unauthenticated attacker with a guest session and valid CSRF token can submit a wildcard channel name to retrieve matching notification events intended for other users. Notification payload generation lacks a corresponding access check, exposing conversation message content, identifiers, URLs, and notification HTML across users and mailboxes. This issue is fixed in version 1.8.226."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-89",
"description": "CWE-89: Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-06T17:00:33.424Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-gh3r-jh6q-wrvj"
},
{
"name": "https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/freescout-help-desk/freescout/commit/1f4deee6369d89a70d291248499883b5bfdb99ff"
},
{
"name": "https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/freescout-help-desk/freescout/commit/656cb2349cd3bb11f04f01c1587900dfb423a855"
},
{
"name": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/freescout-help-desk/freescout/releases/tag/1.8.226"
}
],
"source": {
"advisory": "GHSA-gh3r-jh6q-wrvj",
"discovery": "UNKNOWN"
},
"title": "FreeScout: Cross-User Notification Data Disclosure via LIKE Wildcard Injection in Polycast Channel Query"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-62856",
"datePublished": "2026-11-06T17:00:33.424Z",
"dateReserved": "2026-07-14T21:10:50.032Z",
"dateUpdated": "2026-11-09T22:45:12.686Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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