{"id":"CVE-2025-53971","state":"PUBLISHED","title":"Channel and Team Membership APIs inadvertently allow loss of Member privileges.","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.","publishedAt":"2025-08-21T07:31:01.870Z","updatedAt":"2025-08-21T14:51:19.669Z","severity":{"score":3.8,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"10.5.0","status":"affected","lessThanOrEqual":"10.5.8","versionType":"semver"},{"version":"9.11.0","status":"affected","lessThanOrEqual":"9.11.17","versionType":"semver"},{"version":"10.10.0","status":"unaffected"},{"version":"10.5.9","status":"unaffected"},{"version":"9.11.18","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:09:31.862Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/53xxx/CVE-2025-53971.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-53971","state":"PUBLISHED","datePublished":"2025-08-21T07:31:01.870Z","dateUpdated":"2025-08-21T14:51:19.669Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2025-07-22T07:46:53.204Z"},"containers":{"cna":{"title":"Channel and Team Membership APIs inadvertently allow loss of Member privileges.","descriptions":[{"lang":"en","value":"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":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"10.5.0","status":"affected","lessThanOrEqual":"10.5.8","versionType":"semver"},{"version":"9.11.0","status":"affected","lessThanOrEqual":"9.11.17","versionType":"semver"},{"version":"10.10.0","status":"unaffected"},{"version":"10.5.9","status":"unaffected"},{"version":"9.11.18","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","baseSeverity":"LOW","baseScore":3.8},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","type":"CWE","description":"CWE-863: Incorrect Authorization"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2025-08-21T07:31:01.870Z"},"credits":[{"lang":"en","type":"finder","value":"hackit_bharat"}],"solutions":[{"value":"Update Mattermost to versions 10.10.0, 10.5.9, 9.11.18 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2025-00485","defect":["https://mattermost.atlassian.net/browse/MM-64177"],"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-08-21T14:51:10.911929Z","id":"CVE-2025-53971","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-08-21T14:51:19.669Z"}}]}}}