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Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

PUBLISHED Reserved 2025-12-01 | Published 2026-02-16 | Updated 2026-02-17 | Assigner Mattermost




MEDIUM: 5.7CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Problem types

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Product status

Default status
unaffected

11.1.0 (semver)
affected

10.11.0 (semver)
affected

11.2.0 (semver)
affected

11.3.0
unaffected

11.1.3
unaffected

10.11.10
unaffected

11.2.2
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates (MMSA-2025-00560) vendor-advisory

cve.org (CVE-2025-13821)

nvd.nist.gov (CVE-2025-13821)

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