CVE-2026-93964
Received Received - Intake

Authentication Bypass in NginxProxyManager

Publication date: 2026-09-20

Last updated on: 2026-09-20

Assigner: VulDB

Description
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.

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Meta Information

Published
2026-09-20
Last Modified
2026-09-20
Generated
2026-09-20
AI Q&A
2026-09-20
EPSS Evaluated
N/A
NVD
CVE-2026-93964
EUVD
EUVD-2026-83653

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nginxproxymanager nginx_proxy_manager to 2.15.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is in NginxProxyManager up to version 2.15.1. It affects the internalCertificate.validate function in backend/internal/certificate.js. The issue allows remote attackers to bypass authentication by manipulating certificate validation. The endpoint processes and echoes back submitted certificates without proper checks, enabling unauthenticated openssl processing of attacker-controlled input.

Detection Guidance

Check if your NginxProxyManager instance is running version 2.15.1 or earlier. Inspect network traffic for unauthenticated requests to the internalCertificate.validate endpoint. Monitor logs for unexpected certificate processing attempts.

Impact Analysis

An attacker could exploit this to send malicious certificate data to the server. While no stored data is leaked, the server may process attacker input through openssl without authentication. This could lead to denial of service, unexpected behavior, or further exploitation depending on the server's configuration and environment.

Mitigation Strategies

Upgrade NginxProxyManager to a version beyond 2.15.1 if available. Restrict network access to the certificate validation endpoint. Disable or remove the vulnerable endpoint if no patch is available.

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