CVE-2025-13352: mattermost server — Fix

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.

Is your site exposed to CVE-2025-13352?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

3.0

LOW

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

Weakness Type (CWE)

CWE-1287 CWE-1287

Affected Products

Vendor	Product	Versions
mattermost	mattermost_server	10.11.0 — 10.11.7

References

Advisories & Patches

https://mattermost.com/security-updates

Frequently Asked Questions

What is CVE-2025-13352? +

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. It has a CVSS v3.1 base score of 3.0 (LOW).

How severe is CVE-2025-13352? +

CVE-2025-13352 has a CVSS v3.1 score of 3.0 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-13352? +

CVE-2025-13352 affects products from mattermost, specifically: mattermost_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-13352? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-10825

A denial-of-service vulnerability exists in the WebSocket API due to insufficient validation and handling of JSON-based requests. A low-privileged authenticated …

CVE-2024-8125

Improper Validation of Specified Type of Input vulnerability in OpenText™ Content Management (Extended ECM) allows Parameter Injection. A bad actor …

CVE-2025-9041

A security issue exists due to improper handling of CIP Class 32’s request when a module is inhibited on the …

CVE-2025-9042

A security issue exists due to improper handling of CIP Class 32’s request when a module is inhibited on the …

CVE-2025-61672

Synapse is an open source Matrix homeserver implementation. Lack of validation for device keys in Synapse before 1.138.3 and in …

CVE-2024-6298 10.0

Unauthorized file access in WEB Server in ABB ASPECT - Enterprise v3.08.01; NEXUS Series v3.08.01 ; MATRIX Series v3.08.01 allows …

CVE-2025-13352