What’s Vulnerable › Vulnerabilities

CVE-2025-27134: Privilege escalation in Joplin server via user patch endpoint

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-30 · updated 2026-06-17
• Weakness: CWE-284

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.

Affected products

• laurent22 joplin: before 3.3.3 — fixed in 3.3.3

How to fix

Upgrade to a fixed version: laurent22 joplin 3.3.3. Check the vendor advisory for mitigations.

References

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

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