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.
Metrics
Affected Vendors & Products
References
History
Tue, 22 Sep 2026 19:45:00 +0000
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Tue, 22 Sep 2026 14:30:00 +0000
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Mon, 21 Sep 2026 21:30:00 +0000
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| 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. | |
| Title | Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin) | |
| Weaknesses | CWE-290 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-21T21:14:31.267Z
Updated: 2026-09-22T13:07:10.486Z
Reserved: 2026-06-16T16:16:32.627Z
Link: CVE-2026-55210
Updated: 2026-09-22T13:07:05.671Z
Status : Deferred
Published: 2026-09-21T22:16:56.890
Modified: 2026-09-23T18:30:42.573
Link: CVE-2026-55210
No data.