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Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to enforce the PostEditTimeLimit on non-message post fields which allows an authenticated user to modify post file attachments, props, and pin status after the edit window has expired via the post patch and update API endpoints.. Mattermost Advisory ID: MMSA-2026-00631

PUBLISHED Reserved 2026-03-12 | Published 2026-05-15 | Updated 2026-05-15 | Assigner Mattermost




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

Problem types

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

Product status

Default status
unaffected

11.5.0 (semver)
affected

10.11.0 (semver)
affected

11.6.0
unaffected

11.5.2
unaffected

10.11.14
unaffected

Credits

se1en finder

References

mattermost.com/security-updates (MMSA-2026-00631) vendor-advisory

cve.org (CVE-2026-4053)

nvd.nist.gov (CVE-2026-4053)

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