Auth bypass in Onyx
CVE-2025-51479
Authorization bypass in update_user_group in onyx-dot-app Onyx Enterprise Edition 0.27.0 allows remote authenticated attackers to modify arbitrary user groups via crafted PATCH requests to the /api/manage/admin/user-group/id endpoint, bypassing intended curator-group assignment checks.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Onyx — versions 0.27.0
Weakness classification (CWE)
References
- github.com/onyx-dot-app/onyx (Product)
- github.com/onyx-dot-app/onyx/pull/4714 (Exploit, Issue Tracking)
- www.gecko.security/blog/cve-2025-51479 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-51479?
- CVE-2025-51479 is a medium-severity vulnerability in Onyx, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2025-07-22.
- How severe is CVE-2025-51479?
- Medium severity. CVSS v3 base score is 5.4 out of 10.