{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6673","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-04-20T13:45:33.430Z","datePublished":"2026-06-22T13:38:56.594Z","dateUpdated":"2026-06-22T15:41:08.511Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.7.0","status":"affected","version":"11.7.0","versionType":"semver"},{"lessThanOrEqual":"11.6.2","status":"affected","version":"11.6.0","versionType":"semver"},{"lessThanOrEqual":"11.5.5","status":"affected","version":"11.5.0","versionType":"semver"},{"lessThanOrEqual":"10.11.17","status":"affected","version":"10.11.0","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"}]}],"credits":[{"lang":"en","type":"finder","value":"insomnia1102"}],"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 authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H","baseSeverity":"MEDIUM","baseScore":6.4},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-306: Missing Authentication for Critical Function","cweId":"CWE-306"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00654","tags":["vendor-advisory"]}],"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-2026-00654","defect":["https://mattermost.atlassian.net/browse/MM-68376"],"discovery":"EXTERNAL"},"title":"Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-06-22T13:38:56.594Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-22T15:40:53.578692Z","id":"CVE-2026-6673","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":"2026-06-22T15:41:08.511Z"}}]}}