frp: Authentication bypass in frp HTTP vhost routing when routeByHTTPUser is used for access control

{
  "id": "723b73156ba8ca2265f63196a7cc64e60cfd0a4cc552a435e5fc8b1a6aac8d93",
  "url": "https://osv.dev/vulnerability/CVE-2026-40910",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "frp: Authentication bypass in frp HTTP vhost routing when routeByHTTPUser is used for access control",
    "summary": "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.",
    "evidence": "osv:CVE-2026-40910",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-40910",
      "aliases": [
        "CVE-2026-40910",
        "GHSA-pq96-pwvg-vrr9",
        "GO-2026-5549"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fatedier/frp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fe5fb0326b2aa7741d5b5d8f8c4c3ca12bb4ed91"
                },
                {
                  "fixed": "4ec8de973f52a1cabde54ad3499216cf1bc3dbaf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.68.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:fatedier:frp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.43.0"
                      },
                      {
                        "fixed": "0.68.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.68.0",
            "v0.67.0",
            "v0.66.0",
            "v0.65.0",
            "v0.64.0",
            "v0.63.0",
            "v0.62.1",
            "v0.62.0",
            "v0.61.2",
            "v0.61.1",
            "v0.61.0",
            "v0.60.0",
            "v0.59.0",
            "v0.58.1",
            "v0.58.0",
            "v0.57.0",
            "v0.56.0",
            "v0.55.1",
            "v0.55.0",
            "v0.54.0",
            "v0.53.2",
            "v0.53.1",
            "v0.53.0",
            "v0.52.3",
            "v0.52.2",
            "v0.52.1",
            "v0.52.0",
            "v0.51.3",
            "v0.51.2",
            "v0.51.1",
            "v0.51.0",
            "v0.50.0",
            "v0.49.0",
            "v0.48.0",
            "v0.47.0",
            "v0.46.1",
            "v0.46.0",
            "v0.45.0",
            "v0.44.0",
            "v0.43.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40910.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.772465569Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40910.json",
        "https://github.com/fatedier/frp/security/advisories/GHSA-pq96-pwvg-vrr9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40910"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40910.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40910",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 516998,
  "published_at": "2026-04-21T20:09:00.893+00:00"
}