CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NCVE-2026-28741
High (8.1) in mattermost mattermost server. EPSS 0.1% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 11.3.3, 11.4.3, 11.5.0.
Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625
Severity
- EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 2% of CVEs (scores of 2026-10-31)
- CWE
- CWE-352
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-m7cf-4gh2-v4qg | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20250721062209-4952acea88ce <8.0.0-20260220133927-c29cf05d40f8 | 8.0.0-20260220133927-c29cf05d40f8 |
| GHSA-m7cf-4gh2-v4qg | Go | github.com/mattermost/mattermost/server/v8 | >=11.5.0-rc1 <11.5.0 | 11.5.0 |
| GHSA-m7cf-4gh2-v4qg | Go | github.com/mattermost/mattermost/server/v8 | >=11.4.0-rc1 <11.4.3 | 11.4.3 |
| GHSA-m7cf-4gh2-v4qg | Go | github.com/mattermost/mattermost/server/v8 | >=11.3.0-rc1 <11.3.3 | 11.3.3 |
| GO-2026-5495 | Go | github.com/mattermost/mattermost-server | >=11.3.0-rc1+incompatible <11.3.3+incompatible >=11.4.0-rc1+incompatible <11.4.3+incompatible >=11.5.0-rc1+incompatible <11.5.0+incompatible | 11.3.3+incompatible, 11.4.3+incompatible, 11.5.0+incompatible |
| GO-2026-5495 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2026-5495 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2026-5495 | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20250721062209-4952acea88ce <8.0.0-20260220133927-c29cf05d40f8 | 8.0.0-20260220133927-c29cf05d40f8 |