HIGHCVE-2026-3108Published Modified CNA Mattermost
CVE-2026-3108: Terminal Escape Injection in mmctl Report Posts Command
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
Metrics
- CVSS v3.1
- 8.0
- Severity
- HIGH
- Fixed in
- 10.11.11
- Affected Products
- 1
Fix available
10.11.1111.2.311.3.211.4.111.5.0
Affected packages
- Mattermost / Mattermost≤ 11.2.2 · ≤ 10.11.10 · ≤ 11.4.0 · ≤ 11.3.1Fixed in 11.5.0, 11.2.3, 10.11.11, 11.4.1, 11.3.2
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:HReferences