CVE-2025-12419

Description

Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.

Affected packages (6)

• Go/github.com/mattermost/mattermost-server>= 10.12.0, < 10.12.2
• Go/github.com/mattermost/mattermost-serverfrom 0
• Go/github.com/mattermost/mattermost-server/v5from 0
• Go/github.com/mattermost/mattermost-server/v6from 0
• Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20251028000919-d3ed703dc833
• Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20251028000919-d3ed703dc833

CVSS scores

References (10)

• ADVISORYhttps://github.com/advisories/GHSA-3x39-62h4-f8j6
• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-12419
• PATCHhttps://github.com/mattermost/mattermost
• WEBhttps://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42
• WEBhttps://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a
• WEBhttps://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee
• WEBhttps://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d
• WEBhttps://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6
• WEBhttps://github.com/mattermost/mattermost/pull/34296
• WEBhttps://mattermost.com/security-updates