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.

Classification

CVE ID: CVE-2025-27134

CVSS Base Severity: HIGH

CVSS Base Score: 8.8

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Products

Vendor: laurent22

Product: joplin

Nuclei Template

http/cves/2025/CVE-2025-27134.yaml

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 13.82% (scored less or equal to compared to others)

EPSS Date: 2025-05-29 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-27134
https://github.com/laurent22/joplin/security/advisories/GHSA-xj67-649m-3p8x
https://github.com/laurent22/joplin/commit/12baa9827dac9da903f244c9f358e3deb264e228

Timeline