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Description

Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580

PUBLISHED Reserved 2026-01-29 | Published 2026-03-16 | Updated 2026-03-17 | Assigner Mattermost




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem types

CWE-672: Operation on a Resource after Expiration or Release

Product status

Default status
unaffected

10.11.0 (semver)
affected

11.4.0
unaffected

10.11.11
unaffected

Credits

Joshua Rogers finder

References

mattermost.com/security-updates (MMSA-2026-00580) vendor-advisory

cve.org (CVE-2026-1629)

nvd.nist.gov (CVE-2026-1629)

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