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

Quick assessment

Affected
laurent22 joplin
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joplin是Laurent Cozic个人开发者的一款开源的笔记和待办事项应用程序。 Joplin 3.3.3之前版本存在安全漏洞，该漏洞源于非管理员用户可利用API端点设置is_admin字段，可能导致权限提升。

CVSS 8.8 · High EPSS 1.99% · P79

Public Exploits 1

Nuclei · 1 CVE-2025-27134.yaml [template]

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2025-27134

Vulnerability Information
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Vulnerability Title
Privilege escalation in Joplin server via user patch endpoint
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Joplin 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joplin是Laurent Cozic个人开发者的一款开源的笔记和待办事项应用程序。 Joplin 3.3.3之前版本存在安全漏洞，该漏洞源于非管理员用户可利用API端点设置is_admin字段，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
laurent22 joplin < 3.3.3 -

II. Public POCs for CVE-2025-27134

# POC Description Source Link Shenlong Link
1 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-27134.yaml POC Details
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Qwen3.6-35B-A3B · 6629 chars
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III. Intelligence Information for CVE-2025-27134

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Vendor Advisories for CVE-2025-27134 (1)

IV. Related Vulnerabilities

Same product: joplin
Same vendor: laurent22
Same weakness: CWE-284

V. Comments for CVE-2025-27134

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