Go/github.com/mattermost/mattermost/server/v8 CVE-2025-12419: critical 9.9, EPSS 0.37%

Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20251028000919-d3ed703dc833 or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20251028000919-d3ed703dc833

Affected

Fixed versions

Sources

• osv: GO-2025-4168#Go/github.com/mattermost/mattermost/server/v8
• nvd: CVE-2025-12419
• https://github.com/advisories/GHSA-3x39-62h4-f8j6
• https://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42
• https://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a
• https://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee
• https://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d
• https://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6
• https://github.com/mattermost/mattermost/pull/34296
• https://mattermost.com/security-updates

CVE-2025-12419 · published 2025-12-15T20:33:49Z · modified 2026-03-03T04:57:42.597188Z · JSON