CVE-2025-27134: Privilege escalation in Joplin server via user patch endpoint
Vulnerability summary
CVE-2025-27134 is a high (CVSS 8.8) Improper Access Control vulnerability in joplin_project joplin. EPSS estimates a 2.22% chance of exploitation in the next 30 days, higher than 82.5% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 30-04-2025PublishedVulnerability first disclosed.
- 30-04-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.22%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
Increase +0.15 pp
From 2.07% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundJoplin
Maturity: poc
Weaknesses
CWE · root causeAffected systems
2 vendors · 2 products
References
2 links- github.com/laurent22/joplin/security/advisories/GHSA-xj67-649m-3p8xX Refsource CONFIRMExploitVendor Advisory