CVE-2026-3108

HIGH

Terminal Escape Injection in mmctl Report Posts Command

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00599
https://mattermost.com/security-updates

Scores

CVSS v3 8.0
EPSS 0.0002
EPSS Percentile 4.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-150
Status published
Products (12)
Mattermost/Mattermost 10.11.0 - 10.11.10
Mattermost/Mattermost 10.11.11
Mattermost/Mattermost 11.2.0 - 11.2.2
Mattermost/Mattermost 11.2.3
Mattermost/Mattermost 11.3.0 - 11.3.1
Mattermost/Mattermost 11.3.2
Mattermost/Mattermost 11.4.0
mattermost/mattermost 11.4.0-rc1 - 11.4.1Go
Mattermost/Mattermost 11.4.1
Mattermost/Mattermost 11.5.0
... and 2 more
Published Mar 26, 2026
Tracked Since Mar 26, 2026