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Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin)

CVSS 3.1 7.4 HIGHCheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-55210

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55210

Published

joplin

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "laurent22",
                    "product": "joplin",
                    "versions": [
                        {
                            "version": "< 3.7.2",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 12 Nov 22:49 UTC · 273 of 275 readable · 271 fully read · documentation 469/469 current