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Joplin Server installations are vulnerable to default administrative credentials. The system ships with a default admin account using the credentials admin@localhost:admin. Attackers can leverage these default credentials to gain administrative access to the Joplin Server instance, potentially compromising sensitive user data and system functionality.
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.