Vulnerability in Jc21 nginx Proxy Manager
CVE-2025-50579
A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, particularly JWT tokens, due to improper validation of the Origin header. This misconfiguration enables attackers to intercept tokens using a simple browser script and exfiltrate them to a remote attacker-controlled server, potentially leading to unauthorized actions within the application.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Jc21 nginx Proxy Manager — versions 2.12.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/NginxProxyManager/nginx-proxy-manager (Product)
- github.com/NginxProxyManager/nginx-proxy-manager/issues/4509 (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-50579?
- CVE-2025-50579 is a medium-severity vulnerability in Jc21 nginx Proxy Manager, classified under CWE-1259. CVSS score: 5.3/10. Published 2025-08-19.
- How severe is CVE-2025-50579?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-50579 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.