{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55210","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T16:16:32.627Z","datePublished":"2026-09-21T21:14:31.267Z","dateUpdated":"2026-09-22T13:07:10.486Z"},"containers":{"cna":{"title":"Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin)","problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5"},{"name":"https://github.com/laurent22/joplin/pull/15647","tags":["x_refsource_MISC"],"url":"https://github.com/laurent22/joplin/pull/15647"},{"name":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2","tags":["x_refsource_MISC"],"url":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2"}],"affected":[{"vendor":"laurent22","product":"joplin","versions":[{"version":"< 3.7.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T21:14:31.267Z"},"descriptions":[{"lang":"en","value":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server's UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account's is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user's email can pass POST /api/saml, receive a session for that local account, and access or modify the victim's notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2."}],"source":{"advisory":"GHSA-5px3-4f5x-hjc5","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T13:06:34.047429Z","id":"CVE-2026-55210","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-22T13:07:10.486Z"}}]}}