What is the CVSS score of CVE-2025-27134?

CVE-2025-27134 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 13.4%.

Which versions of Joplin are affected by CVE-2025-27134?

Organizations using Joplin face significant risk from CVE-2025-27134, a improper access control vulnerability rated CVSS 8.8.. A patch is available.

Is there a public PoC exploit available for CVE-2025-27134?

Yes, a public proof-of-concept exploit is available for CVE-2025-27134. Prioritise patching immediately. EPSS: 13.4%.

How to fix or mitigate CVE-2025-27134?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Vendor patch is available.

Joplin CVE-2025-27134

HIGH

Improper Access Control (CWE-284)

2025-04-30 security-advisories@github.com

Authentication Bypass Privilege Escalation Joplin

8.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.8 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:39 vuln.today

Patch released

Mar 28, 2026 - 18:39 nvd

Patch available

PoC Detected

May 16, 2025 - 16:32 vuln.today

Public exploit code

CVE Published

Apr 30, 2025 - 15:16 nvd

HIGH 8.8

DescriptionGitHub Advisory

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.

AnalysisAI

Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and EPSS exploitation probability 13.4%.

Technical ContextAI

This vulnerability is classified under CWE-284. 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 include: Joplin Project Joplin. Version information: version 3.3.3.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.