Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fatedier | Frp | >= 0.43.0, < 0.68.1 |
Related Weaknesses (CWE)
References
- https://github.com/fatedier/frp/security/advisories/GHSA-pq96-pwvg-vrr9ExploitVendor Advisory
- https://github.com/fatedier/frp/security/advisories/GHSA-pq96-pwvg-vrr9ExploitVendor Advisory
FAQ
What is CVE-2026-40910?
CVE-2026-40910 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2026-40910?
CVE-2026-40910 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-40910?
Check the references section above for vendor advisories and patch information. Affected products include: Fatedier Frp.