{"id":"CVE-2026-55210","title":"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks","summary":"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 …","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-290"],"vendor":"laurent22","product":"joplin","affected":["joplin < 3.7.2"],"published":"2026-09-21","updated":"2026-09-22","sourceUpdated":"2026-09-22T14:17:13.560","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55210","references":[{"url":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2","label":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/pull/15647","label":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"epss":0.00376,"epssPercentile":0.31512,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-22T13:06:34.047429Z"},"ingestedAt":"2026-09-21T21:53:57.433Z","slug":"CVE-2026-55210","body":"## Overview\n\nJoplin 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}