CVE-2025-53971

Summary

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.

Affected Software

VendorProductVersion RangeStatus
MattermostMattermost10.5.0 <= 10.5.8affected
MattermostMattermost9.11.0 <= 9.11.17affected
MattermostMattermost10.10.0unaffected
MattermostMattermost10.5.9unaffected
MattermostMattermost9.11.18unaffected

Weaknesses

  • CWE-863: CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References