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Description

Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.

PUBLISHED Reserved 2025-07-22 | Published 2025-08-21 | Updated 2025-08-21 | Assigner Mattermost




LOW: 3.8CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

10.5.0
affected

9.11.0
affected

10.10.0
unaffected

10.5.9
unaffected

9.11.18
unaffected

Credits

hackit_bharat finder

References

mattermost.com/security-updates

cve.org (CVE-2025-53971)

nvd.nist.gov (CVE-2025-53971)

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