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

Subscriptions

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Tracking

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Advisories

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Fixes

Solution

Update Mattermost to versions 11.5.0, 11.2.3, 10.11.11, 11.4.1, 11.3.2 or higher.


Workaround

No workaround given by the vendor.

References
History

Thu, 26 Mar 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 26 Mar 2026 16:45:00 +0000

Type Values Removed Values Added
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
Title Terminal Escape Injection in mmctl Report Posts Command
Weaknesses CWE-150
References
Metrics cvssV3_1

{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-03-26T17:51:15.326Z

Reserved: 2026-02-24T10:50:40.507Z

Link: CVE-2026-3108

cve-icon Vulnrichment

Updated: 2026-03-26T17:47:48.522Z

cve-icon NVD

Status : Received

Published: 2026-03-26T17:16:41.797

Modified: 2026-03-26T17:16:41.797

Link: CVE-2026-3108

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses