Auth bypass in Nginxproxymanager Nginx-Proxy-Manager
CVE-2026-93964
A vulnerability was detected in NginxProxyManager nginx-proxy-manager up to 2.15.1. This impacts the function internalCertificate.validate of the file backend/internal/certificate.js of the component Validate Route. The manipulation results in missing authentication. The attack can be launched remotely. The exploit is now public and may be used. Endpoint only processes and echoes back the certificate the caller submits (no stored data leaked); the real risk is unauthenticated openssl processing of attacker input. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Broken Authentication
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: 0.005 (39.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Nginxproxymanager Nginx-Proxy-Manager — versions 2.0, 2.1, 2.1.0
Weakness classification (CWE)
References
- vuldb.com/vuln/407923 (technical-description, vdb-entry)
- vuldb.com/vuln/407923/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-93964 (third-party-advisory)
- vuldb.com/submit/944336 (third-party-advisory)
- github.com/NginxProxyManager/nginx-proxy-manager/issues/5594 (issue-tracking, exploit)
- github.com/NginxProxyManager/nginx-proxy-manager/ (product)
Frequently asked questions
- What is CVE-2026-93964?
- CVE-2026-93964 is a medium-severity vulnerability in Nginxproxymanager Nginx-Proxy-Manager, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-09-20.
- How severe is CVE-2026-93964?
- Medium severity. CVSS v3 base score is 5.3 out of 10.