MCP Registry: Open Redirect

{
  "id": "be9f203affbce2d498403efc2ee95de1f598b729131bd81cee79183baefbf06a",
  "url": "https://osv.dev/vulnerability/CVE-2026-44427",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MCP Registry: Open Redirect",
    "summary": "The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. From 1.1.0 to 1.7.4, the TrailingSlashMiddleware in internal/api/server.go is vulnerable to an open redirect attack. An attacker can craft a URL with a protocol-relative path (e.g., //evil.com/) that, after trailing slash removal, results in a Location header of //evil.com — which browsers interpret as an absolute URL to an external domain. This vulnerability is fixed in 1.7.5.",
    "evidence": "osv:CVE-2026-44427",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-44427",
      "aliases": [
        "CVE-2026-44427",
        "GHSA-v8vw-gw5j-w7m6",
        "GO-2026-5658"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/modelcontextprotocol/registry",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ae00f70eaf2202970d74f5d459fd174ab8445a8a"
                },
                {
                  "fixed": "1201cbd82b2cf6d4b56edfc05c763059a12f9fdb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.1.0"
                      },
                      {
                        "fixed": "1.7.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.7.5"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.7.4",
            "v1.7.3",
            "v1.7.2",
            "v1.7.1",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.10",
            "v1.3.9",
            "v1.3.8",
            "v1.3.7",
            "v1.3.6",
            "v1.3.5",
            "v1.3.4",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.3",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44427.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.291920256Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44427.json",
        "https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44427"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-601"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44427.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44427",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505715,
  "published_at": "2026-05-14T21:07:34.364+00:00"
}