{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9597","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-05-26T15:15:14.343Z","datePublished":"2026-07-13T08:17:36.717Z","dateUpdated":"2026-07-13T13:55:15.448Z"},"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"},{"version":"11.8.0","status":"unaffected"},{"version":"11.7.3","status":"unaffected"},{"version":"11.6.5","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"alimursaliyev"}],"descriptions":[{"lang":"en","value":"Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","baseSeverity":"MEDIUM","baseScore":5.4},"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-2026-00681","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00681","defect":["https://mattermost.atlassian.net/browse/MM-68994"],"discovery":"EXTERNAL"},"title":"Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-07-13T08:17:36.717Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-13T13:55:09.692643Z","id":"CVE-2026-9597","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-13T13:55:15.448Z"}}]}}