CVE-2025-10545
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
- CVSS 3.1
- 4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-25)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-424h-xj87-m937 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250820115038-ff30b84049f0 | 8.0.0-20250820115038-ff30b84049f0 |
| GHSA-424h-xj87-m937 | Go | github.com/mattermost/mattermost-server | >=10.5.0 <10.5.11 | 10.5.11 |
| GHSA-424h-xj87-m937 | Go | github.com/mattermost/mattermost-server | >=10.11.0 <10.11.3 | 10.11.3 |
| GO-2025-4030 | Go | github.com/mattermost/mattermost-server | >=10.5.0+incompatible <10.5.11+incompatible >=10.11.0+incompatible <10.11.3+incompatible | 10.5.11+incompatible, 10.11.3+incompatible |
| GO-2025-4030 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-4030 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-4030 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250820115038-ff30b84049f0 | 8.0.0-20250820115038-ff30b84049f0 |