CVE-2025-13352 - CVE House
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Status published Low CVE-2025-13352

Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

Vulnerability Description

Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Juho Forsén

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.11.0, 11.1.0, 10.11.7

Timeline

Official Publish: December 17th, 2025
Last Modified: December 17th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N

Weaknesses (CWE)

CWE-1287

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.