laurent22 Joplin up to 3.7.1 SSO Authentication /api/login_with_code excessive authentication

Summaryinfo

A vulnerability has been found in laurent22 Joplin up to 3.7.1 and classified as problematic. This impacts an unknown function of the file /api/login_with_code of the component SSO Authentication. Performing a manipulation results in excessive authentication. This vulnerability is known as CVE-2026-46649. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in laurent22 Joplin up to 3.7.1. This affects an unknown part of the file /api/login_with_code of the component SSO Authentication. The manipulation with an unknown input leads to a excessive authentication vulnerability. CWE is classifying the issue as CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. This is going to have an impact on confidentiality. The summary by CVE is:

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 GET /api/login_with_code/:id endpoint accepts a nine-digit SSO authentication code with a ten-minute lifetime without applying limiterLoginBruteForce. An unauthenticated attacker who targets a user during an active SSO login can make unlimited guesses, and a correct code returns a full session token that permits access to and modification of the user's notes, notebooks, and account settings. This issue is fixed in version 3.7.2.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-46649 since 05/15/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1110.001 for this issue.

Upgrading to version 3.7.2 eliminates this vulnerability.

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Productinfo

Vendor

• laurent22

Name

• Joplin

Version

• 3.7.0
• 3.7.1

Website

• Product: https://github.com/laurent22/joplin/

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