CVE-2025-12419 json
Account takeover on OAuth/OpenID-enabled servers
published 2025-11-27 11 mo ago modified 2026-10-19 20 d ago also GHSA-3x39-62h4-f8j6 , GO-2025-4168 , EUVD-2025-199827
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/mattermost/mattermost/server/v8 8.0.0-20251028000919-d3ed703dc833
- go github.com/mattermost/mattermost-server 10.5.13, 10.11.5, 10.12.2, 11.0.4
- Mattermost Mattermost 10.5.13, 10.11.5, 10.12.2, 11.0.4, 11.1.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20251230T014957-150000.1.134.1
suse advisories SUSE-SU-2026:0037-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 11 mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20251028000919-d3ed703dc833 |
8.0.0-20251028000919-d3ed703dc833 |
| go | github.com/mattermost/mattermost-server | >=10.12.0, <10.12.2 >=10.11.0, <10.11.5 >=10.5.0, <10.5.13 >=11.0.0, <11.0.4 all versions |
10.12.2 10.11.5 10.5.13 11.0.4 |
| go | github.com/mattermost/mattermost-server/v5 | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server/v6 | all versions |
no fix listed |
Affected products
- Mattermost Mattermost
Classification
References
-
github.com
/mattermost/mattermost/pull/34296
web
-
github.com
/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42
web
-
github.com
/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a
web
-
github.com
/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee
web
-
github.com
/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d
web
-
github.com
/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-12419
advisory
-
github.com
/advisories/GHSA-3x39-62h4-f8j6
advisory
-
github.com
/mattermost/mattermost
package
Sources
- CVE List CVE-2025-12419
- GitHub Advisory GHSA-3x39-62h4-f8j6
- NVD CVE-2025-12419
- OSV GO-2025-4168
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