CVE-2025-12419
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.
- CVSS 3.1
- 9.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-25)
- CWE
- CWE-303
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3x39-62h4-f8j6 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20251028000919-d3ed703dc833 | 8.0.0-20251028000919-d3ed703dc833 |
| GHSA-3x39-62h4-f8j6 | Go | github.com/mattermost/mattermost-server | >=10.12.0 <10.12.2 | 10.12.2 |
| GHSA-3x39-62h4-f8j6 | Go | github.com/mattermost/mattermost-server | >=10.11.0 <10.11.5 | 10.11.5 |
| GHSA-3x39-62h4-f8j6 | Go | github.com/mattermost/mattermost-server | >=10.5.0 <10.5.13 | 10.5.13 |
| GHSA-3x39-62h4-f8j6 | Go | github.com/mattermost/mattermost-server | >=11.0.0 <11.0.4 | 11.0.4 |
| GO-2025-4168 | Go | github.com/mattermost/mattermost-server | all versions | no fix published |
| GO-2025-4168 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-4168 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-4168 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20251028000919-d3ed703dc833 | 8.0.0-20251028000919-d3ed703dc833 |