What’s Vulnerable › Vulnerabilities
CVE-2025-13352: Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking
- Severity: low (CVSS 3.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-12-17 · updated 2026-10-13
- Weakness: CWE-1287
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.
Affected products
- Mattermost: from 10.11.0 before 10.11.7 — fixed in 10.11.7
How to fix
Upgrade to a fixed version: Mattermost 10.11.7. Check the vendor advisory for mitigations.
References
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