CVE-2026-3108
Fixed in a distro release EPSS <1%CVSS 8.0
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
Products: Mattermost
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.11.11+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.2.3+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.3.2+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.4.1+incompatible |
| Go | github.com/mattermost/mattermost-server/v5 | no fix |
| Go | github.com/mattermost/mattermost-server/v6 | no fix |
| Go | github.com/mattermost/mattermost/server/v8 | 11.4.1 |
| Go | github.com/mattermost/mattermost/server/v8 | 11.3.2 |
| Go | github.com/mattermost/mattermost/server/v8 | 11.2.3 |
| Go | github.com/mattermost/mattermost/server/v8 | 10.11.11 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20260217110922-b7d4a1f1f59b |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 |