CVE-2026-46649: LAURENT22 Joplin

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• LAURENT22 Joplin: before 3.7.2 (fixed in 3.7.2)

Published 2026-09-21. Last modified 2026-09-28.