{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9571","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-05-26T11:52:27.228Z","datePublished":"2026-07-13T07:50:55.793Z","dateUpdated":"2026-07-15T04:00:07.436Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.7.2","status":"affected","version":"11.7.0","versionType":"semver"},{"lessThanOrEqual":"11.6.4","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"10.11.19","status":"affected","version":"10.11.0","versionType":"semver"},{"version":"11.8.0","status":"unaffected"},{"version":"11.7.3","status":"unaffected"},{"version":"11.6.5","status":"unaffected"},{"version":"10.11.20","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"kirs112"}],"descriptions":[{"lang":"en","value":"Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N","baseSeverity":"MEDIUM","baseScore":5.9},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-305 – Authentication Bypass by Primary Weakness","cweId":"CWE-305"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00680","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5, 10.11.20 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00680","defect":["https://mattermost.atlassian.net/browse/MM-68982"],"discovery":"EXTERNAL"},"title":"Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-07-13T07:50:55.793Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-14T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-9571"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-15T04:00:07.436Z"}}]}}