{"id":"CVE-2026-40910","aliases":["GHSA-pq96-pwvg-vrr9","GO-2026-5549"],"url":"https://o3.security/vulnerability/CVE-2026-40910","summary":"frp: Authentication bypass in frp HTTP vhost routing when routeByHTTPUser is used for access control","details":"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.","published":"2026-04-21T20:09:00.893Z","modified":"2026-07-31T18:31:44.700557785Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/fatedier/frp","fixedVersion":"0.68.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40910.json"},{"type":"ADVISORY","url":"https://github.com/fatedier/frp/security/advisories/GHSA-pq96-pwvg-vrr9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40910"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:44.700557785Z"}}