{"id":"CVE-2026-9162","state":"PUBLISHED","title":"Global session revocation does not invalidate active WebSocket connections","description":"Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664","publishedAt":"2026-06-22T13:36:43.998Z","updatedAt":"2026-06-22T15:40:07.851Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.7.0","status":"affected","lessThanOrEqual":"11.7.0","versionType":"semver"},{"version":"11.6.0","status":"affected","lessThanOrEqual":"11.6.2","versionType":"semver"},{"version":"11.5.0","status":"affected","lessThanOrEqual":"11.5.5","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.17","versionType":"semver"},{"version":"11.8.0","status":"unaffected"},{"version":"11.7.1","status":"unaffected"},{"version":"11.6.3","status":"unaffected"},{"version":"11.5.6","status":"unaffected"},{"version":"10.11.18","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-613"],"ingestedAt":"2026-10-29T20:13:52.441Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/9xxx/CVE-2026-9162.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9162","state":"PUBLISHED","datePublished":"2026-06-22T13:36:43.998Z","dateUpdated":"2026-06-22T15:40:07.851Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2026-05-21T11:17:28.560Z"},"containers":{"cna":{"title":"Global session revocation does not invalidate active WebSocket connections","descriptions":[{"lang":"en","value":"Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664"}],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.7.0","status":"affected","lessThanOrEqual":"11.7.0","versionType":"semver"},{"version":"11.6.0","status":"affected","lessThanOrEqual":"11.6.2","versionType":"semver"},{"version":"11.5.0","status":"affected","lessThanOrEqual":"11.5.5","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.17","versionType":"semver"},{"version":"11.8.0","status":"unaffected"},{"version":"11.7.1","status":"unaffected"},{"version":"11.6.3","status":"unaffected"},{"version":"11.5.6","status":"unaffected"},{"version":"10.11.18","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00664","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","baseSeverity":"MEDIUM","baseScore":4.3},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-613","lang":"en","type":"CWE","description":"CWE-613: Insufficient Session Expiration"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2026-06-22T13:36:43.998Z"},"credits":[{"lang":"en","type":"finder","value":"winfunc"}],"solutions":[{"value":"Update Mattermost to versions 11.8.0, 11.7.1, 11.6.3, 11.5.6, 10.11.18 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00664","defect":["https://mattermost.atlassian.net/browse/MM-68542"],"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-22T15:39:54.095237Z","id":"CVE-2026-9162","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":"2026-06-22T15:40:07.851Z"}}]}}}