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

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Meta Information

Published

2025-12-17

Last Modified

2025-12-29

Generated

2026-07-06

AI Q&A

2025-12-17

EPSS Evaluated

2026-07-05

NVD

CVE-2025-13352

EUVD

EUVD-2025-203891

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.11.0 (inc) to 10.11.7 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

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.

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