CVE-2025-27134: joplin Access Control Flaw

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.

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CVSS v3.1 Score

8.8

HIGH

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

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
joplin_project	joplin	< 3.3.3

References

Advisories & Patches

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

Exploits

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

Frequently Asked Questions

What is CVE-2025-27134? +

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-27134? +

CVE-2025-27134 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-27134? +

CVE-2025-27134 affects products from joplin_project, specifically: joplin. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27134? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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