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CVE-2025-13352

Good to know:

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Date: December 17, 2025

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.

Severity Score

Related Resources (7)

https://github.com/advisories/GHSA-jf5h-xfw4-p8gp
https://github.com/mattermost/mattermost-plugin-github/commit/0deffcfc6bee7eaf01f7c99100e3d12e8d9df68c
https://github.com/mattermost/mattermost
https://github.com/mattermost/mattermost/commit/3b05384dd0146c1be3caa620a42e00e46027055d
https://nvd.nist.gov/vuln/detail/CVE-2025-13352
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-13352

Severity Score

Weakness Type (CWE)

Improper Validation of Specified Type of Input

CWE-1287

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v10.11.7;github.com/mattermost/mattermost - v11.1.0;github.com/mattermost/mattermost - v11.1.0+incompatible;github.com/mattermost/mattermost-plugin-github - v1.0.1-0.20250829075715-0deffcfc6bee;github.com/mattermost/mattermost-plugin-github - v1.0.1-0.20250829075715-0deffcfc6bee;https://github.com/mattermost/mattermost-plugin-github.git - v2.5.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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