CVE-2025-27134: Joplin Project Joplin

High severity, CVSS 8.8. EPSS: 2.2% chance of exploitation in the next 30 days.

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. Prior to version 3.3.3, a privilege escalation vulnerability exists in the Joplin server, allowing non-admin users to exploit the API endpoint `PATCH /api/users/:id` to set the `is_admin` field to 1. The vulnerability allows malicious low-privileged users to perform administrative actions without proper authorization. This issue has been patched in version 3.3.3.

Affected products

• Joplin Project Joplin: before 3.3.3 (fixed in 3.3.3)

Published 2025-04-30. Last modified 2026-06-17.