CVSS 3.1
2.7 lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:NCVE-2025-27715
Low (2.7) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 9.11.9.
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 12% 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-cw7q-5cgc-h3h9 | Go | github.com/mattermost/mattermost/server/v8 | >=9.11.0 <9.11.9 | 9.11.9 |
| GO-2025-3555 | Go | github.com/mattermost/mattermost-server | >=9.11.0+incompatible <9.11.9+incompatible | 9.11.9+incompatible |
| GO-2025-3555 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-3555 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-3555 | Go | github.com/mattermost/mattermost/server/v8 | all versions | no fix published |