GHSA-mp6x-97xj-9x62CriticalCVSS 9.9
Mattermost fails to to verify the token used during code exchange
🔗 CVE IDs covered (1)
📋 Description
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that the token used during the code exchange originates from the same authentication flow, which allows an authenticated user to perform account takeover via a specially crafted email address used when switching authentication methods and sending a request to the /users/login/sso/code-exchange endpoint. The vulnerability requires ExperimentalEnableAuthenticationTransfer to be enabled (default: enabled) and RequireEmailVerification to be disabled (default: disabled).
🎯 Affected products5
- go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20251022210333-acda1fb5dd46
- go/github.com/mattermost/mattermost-server:>= 11.0.0, < 11.0.3
- go/github.com/mattermost/mattermost-server:>= 10.12.0, < 10.12.2
- go/github.com/mattermost/mattermost-server:>= 10.11.0, < 10.11.5
- go/github.com/mattermost/mattermost-server:>= 10.5.0, < 10.5.13
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2025-12421
- https://mattermost.com/security-updates
- https://github.com/mattermost/mattermost/commit/5072bbf689a46b3b97b2373f26149f5891396e6b
- https://github.com/mattermost/mattermost/commit/acda1fb5dd46a2f46c76ae67012423c760525eaa
- https://github.com/mattermost/mattermost/commit/f361e7d75a7ab9df5a2106e1ceb919b94b55e41d
- https://github.com/mattermost/mattermost/commit/feb598ed2b7ac3cb78a253b032ad7e4628b0de00
- https://github.com/advisories/GHSA-mp6x-97xj-9x62