CVE-2026-3108

Terminal Escape Injection in mmctl Report Posts Command

State: Published
Severity: 8.0 High
Published: Mar 26, 2026
Updated: Mar 27, 2026
Reserved: Feb 24, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	8.0 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H	Mattermost

Weaknesses

CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences

Affected Products

Product	Versions
MattermostMattermost	11.2.0 through 11.2.2Affected 10.11.0 through 10.11.10Affected 11.4.0 through 11.4.0Affected 11.3.0 through 11.3.1Affected 11.5.0Not affected 11.2.3Not affected 10.11.11Not affected 11.4.1Not affected 11.3.2Not affected

References

MMSA-2026-00599vendor-advisory

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