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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

PUBLISHED Reserved 2026-02-24 | Published 2026-03-26 | Updated 2026-03-27 | Assigner Mattermost




HIGH: 8.0CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Problem types

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

Product status

Default status
unaffected

11.2.0 (semver)
affected

10.11.0 (semver)
affected

11.4.0 (semver)
affected

11.3.0 (semver)
affected

11.5.0
unaffected

11.2.3
unaffected

10.11.11
unaffected

11.4.1
unaffected

11.3.2
unaffected

Credits

winfunc finder

References

mattermost.com/security-updates (MMSA-2026-00599) vendor-advisory

cve.org (CVE-2026-3108)

nvd.nist.gov (CVE-2026-3108)

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