# CVE-2026-40910

> Vulnerability · severity: **MEDIUM** (CVSS 6.5).

## Description

frp is a fast reverse proxy. From 0.43.0 to 0.68.0, frp contains an authentication bypass in the HTTP vhost routing path when routeByHTTPUser is used as part of access control. In proxy-style requests, the routing logic uses the username from Proxy-Authorization to select the routeByHTTPUser backend, while the access control check uses credentials from the regular Authorization header. As a result, an attacker who can reach the HTTP vhost entrypoint and knows or can guess the protected routeByHTTPUser value may access a backend protected by httpUser / httpPassword even with an incorrect Proxy-Authorization password. This issue affects deployments that explicitly use routeByHTTPUser. It does not affect ordinary HTTP proxies that do not use this feature. This vulnerability is fixed in 0.68.1.

## Key facts

- **CVE ID:** CVE-2026-40910
- **Published:** 2026-04-21
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.5
- **CWE codes:** CWE-287, NVD-CWE-noinfo

## Affected products

- `fatedier:frp`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40910

## Citation

> AI Analytics. CVE-2026-40910. Retrieved 2026-07-16 from https://api.ai-analytics.org/cve/CVE-2026-40910. Derived from NIST NVD. Licensed CC0.

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