CVE-2025-27134

Privilege escalation in Joplin server via user patch endpoint

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

laurent22 · joplin

CVSS v3.1 NVD

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

2.22% chance of exploitation in the next 30 days, 82nd percentile

Nuclei

high · CWE-284

Published

2025-04-30

Proof-of-concept exploits (1)

• laurent22/joplin/security/advisories/GHSA-xj67-649m-3p8x

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-27134.yaml

Security advisories

• laurent22/joplin/commit/12baa9827dac9da903f244c9f358e3deb264e228

References

• CVE Record
• NVD entry