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TI-2025-19991 Aliases CVE-2025-27134

Privilege escalation in Joplin server via user patch endpoint

Priority HIGH 73CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.02256 83rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed joplin (laurent22): 3.3.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
laurent22joplinbefore 3.3.33.3.3Patch availableCNA
  • joplin Vendorlaurent22 Affected before 3.3.3 Fixed in 3.3.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:joplin_project:joplin:*:*:*:*:*:-:*:*before 3.3.3Vulnerablelaurent22
  • cpe:2.3:a:joplin_project:joplin:*:*:*:*:*:-:*:* Versions before 3.3.3 Vulnerable ·laurent22

Remediation

  • Fix · CNA joplin (laurent22) Fixed in 3.3.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27134

References

Exploit 1

Patch 1

  • TI-2023-24472 Arbitrary code execution on click of PDF links in Joplin CVSS 3.1CRITICAL 9.0
  • TI-2024-32950 Remote Code Execution on click of <a> Link in markdown preview CVSS 3.1CRITICAL 9.6
  • TI-2024-27054 Joplin has a parsing error leading to Cross-site Scripting (XSS) CVSS 3.1CRITICAL 9.7
  • TI-2025-17795 Cross-site Scripting (XSS) in Rich Text Editor allows arbitrary code execution in Joplin CVSS 3.1CRITICAL 9.6
  • TI-2024-35730 Lack of validation on openExternal allows 1 click remote code execution in joplin CVSS 3.1HIGH 8.8
  • TI-2025-20244 Joplin Server Vulnerable to Path Traversal CVSS 3.1HIGH 7.5
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences