Privilege escalation in Joplin server via user patch endpoint

Vulnerability Description

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.

References

• https://github.com/laurent22/joplin/security/advisories/GHSA-xj67-649m-3p8x
• https://github.com/laurent22/joplin/commit/12baa9827dac9da903f244c9f358e3deb264e228