{"id":"CVE-2026-55210","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55210","generatedAt":"2026-10-28T02:57:12.155Z","title":"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…","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.","published":"2026-09-21T22:16:57.000Z","lastModified":"2026-09-23T18:30:43.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-290"],"affected":[],"epss":{"score":0.00479,"percentile":0.41079,"date":"2026-10-26","history":[{"date":"2026-09-22","score":0.00376,"percentile":0.31512}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-21T22:16:57.000Z","detail":{"score":"7.4","severity":"HIGH","publishedAt":"2026-09-21T22:16:56.890Z"},"summary":"New CVE, high severity (CVSS 7.4)."}],"references":[{"url":"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2","source":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/pull/15647","source":"security-advisories@github.com"},{"url":"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55210","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}