CVSS 3.1
4.3 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NCVE-2026-4055
Medium (4.3) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 8.0.0-20260320113102-f2b3d1c6a945.
Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-31)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-6cfr-wp44-6qmv | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20260304132957-9f2616376582 <8.0.0-20260320113102-f2b3d1c6a945 | 8.0.0-20260320113102-f2b3d1c6a945 |
| GO-2026-5173 | Go | github.com/mattermost/mattermost-server | all versions | no fix published |
| GO-2026-5173 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2026-5173 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2026-5173 | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20260304132957-9f2616376582 <8.0.0-20260320113102-f2b3d1c6a945 | 8.0.0-20260320113102-f2b3d1c6a945 |