{"id":"CVE-2026-55210","published":"2026-09-21T22:16:56.890","lastModified":"2026-09-21T22:16:56.890","description":"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.","cvssScore":7.4,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwes":["CWE-290"],"vendors":[],"products":[],"references":[{"url":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2","tags":[]},{"url":"https://github.com/laurent22/joplin/pull/15647","tags":[]},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5","tags":[]}],"exploitRefs":[{"url":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2","tags":[]},{"url":"https://github.com/laurent22/joplin/pull/15647","tags":[]},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows an attacker to gain access to a local user's Joplin account by exploiting SAML authentication, potentially leading to unauthorized access or modifications of notes and settings.","exploitability":"Exploitation requires control over an IdP session asserting a local user’s email, making it moderately difficult but feasible in mixed authentication deployments.","blast_radius":"If exploited, the impact is high as it can lead to full access to sensitive data and configurations of affected users without needing their password.","remediation":"Update Joplin Server to version 3.7.2 or later to mitigate this vulnerability.","tags":["auth-bypass","saml","webapp","note-taking"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:16:11.302Z"}}