CVE-2025-13352
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-17

Last updated on: 2025-12-29

Assigner: Mattermost, Inc.

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-12-17
Last Modified
2025-12-29
Generated
2026-06-16
AI Q&A
2025-12-17
EPSS Evaluated
2026-06-15
NVD
CVE-2025-13352
EUVD
EUVD-2025-203891
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost_server From 10.11.0 (inc) to 10.11.7 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-1287 The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in Mattermost versions 10.11.x up to 10.11.6 and Mattermost GitHub plugin versions up to 2.4.0. It occurs because these versions fail to validate the identity of plugin bots during reaction forwarding. This flaw allows attackers to hijack the GitHub reaction feature by sending crafted notification posts, causing users to add reactions to arbitrary GitHub objects without their intent.

Impact Analysis

The vulnerability can impact you by allowing attackers to manipulate GitHub reactions on your behalf through crafted notification posts. This could lead to unauthorized reactions being added to GitHub objects, potentially causing confusion, miscommunication, or misuse of reaction features within your GitHub repositories.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-13352. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart