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Description

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

PUBLISHED Reserved 2025-11-04 | Published 2025-12-17 | Updated 2025-12-17 | Assigner Mattermost




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-1287: Improper Validation of Specified Type of Input

Product status

Default status
unaffected

11.0.0 (semver)
affected

10.12.0 (semver)
affected

10.11.0 (semver)
affected

11.1.0
unaffected

11.0.5
unaffected

10.12.3
unaffected

10.11.7
unaffected

Credits

National Security Agency finder

References

mattermost.com/security-updates

cve.org (CVE-2025-12689)

nvd.nist.gov (CVE-2025-12689)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.