CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2026-3108
High (8.8) in mattermost mattermost server. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost/server/v8 10.11.11, 11.2.3, 11.3.2.
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
- CWE
- CWE-150
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3439-vqgj-2gcf | Go | github.com/mattermost/mattermost/server/v8 | >=11.4.0-rc1 <11.4.1 | 11.4.1 |
| GHSA-3439-vqgj-2gcf | Go | github.com/mattermost/mattermost/server/v8 | >=11.3.0-rc1 <11.3.2 | 11.3.2 |
| GHSA-3439-vqgj-2gcf | Go | github.com/mattermost/mattermost/server/v8 | >=11.2.0-rc1 <11.2.3 | 11.2.3 |
| GHSA-3439-vqgj-2gcf | Go | github.com/mattermost/mattermost/server/v8 | >=10.11.0-rc1 <10.11.11 | 10.11.11 |
| GHSA-3439-vqgj-2gcf | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20260105080200-d27a2195068d <8.0.0-20260217110922-b7d4a1f1f59b | 8.0.0-20260217110922-b7d4a1f1f59b |
| GO-2026-5067 | Go | github.com/mattermost/mattermost-server | >=10.11.0-rc1+incompatible <10.11.11+incompatible >=11.2.0-rc1+incompatible <11.2.3+incompatible >=11.3.0-rc1+incompatible <11.3.2+incompatible >=11.4.0-rc1+incompatible <11.4.1+incompatible | 10.11.11+incompatible, 11.2.3+incompatible, 11.3.2+incompatible, 11.4.1+incompatible |
| GO-2026-5067 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2026-5067 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2026-5067 | Go | github.com/mattermost/mattermost/server/v8 | >=8.0.0-20260105080200-d27a2195068d <8.0.0-20260217110922-b7d4a1f1f59b | 8.0.0-20260217110922-b7d4a1f1f59b |