Improper Authentication

Mattermost is vulnerable to improper authentication. The vulnerability is due to failure to validate plugin bot identity in reaction forwarding, which allows an attacker to hijack the GitHub reaction feature and make users add reactions to arbitrary GitHub objects via crafted notification posts...

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...

Mattermost GitHub Plugin Bot Identity Validation Bypass Allows Arbitrary GitHub Reaction Injection

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...

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...

CVE-2025-13352

Mattermost vulnerability CVE-2025-13352 affects Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions = 2.5.0-rc1 or higher) or apply vendor-supplied security updates. Further advisories from Red Hat, CIRCL, OSV, GHSA, and others corroborate the identity validation bypas...

CVE-2025-13352 Mattermost GitHub Plugin allows unauthorized GitHub reactions via reaction forwarding hijacking

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...

PT-2025-51825

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...

Mattermost 安全漏洞

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. Mattermost suffers from a security vulnerability that stems from not verifying the identity of a plugin bot in a reaction forward, which could lead to the hijacking of the GitHub reaction function via...