{ "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" } } ] } }