{"cve":"CVE-2026-44427","nvd":{"published":"2026-05-14T22:16:44.450","modified":"2026-10-26T14:10:00.130","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":0.0},"cvss_v3":null,"cwes":["CWE-601"],"references":["https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6","https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6"],"products":[],"source":"nvd","synced_at":"2026-10-26T14:27:29.784594657+00:00"},"epss":{"cve":"CVE-2026-44427","score":0.0041,"percentile":0.34941,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-v8vw-gw5j-w7m6","url":"https://osv.dev/vulnerability/GHSA-v8vw-gw5j-w7m6","summary":"MCP Registry has open redirect via protocol-relative path in trailing-slash middleware","modified":"2026-09-10T03:50:47.559591959Z","packages":[{"ecosystem":"Go","name":"github.com/modelcontextprotocol/registry","purl":"pkg:golang/github.com/modelcontextprotocol/registry","ranges":[">=1.1.0 <1.7.5"],"fixed":["1.7.5"]}]},{"id":"GO-2026-5658","url":"https://osv.dev/vulnerability/GO-2026-5658","summary":"MCP Registry has open redirect via protocol-relative path in trailing-slash middleware in github.com/modelcontextprotocol/registry","modified":"2026-06-25T23:01:38.745101605Z","packages":[{"ecosystem":"Go","name":"github.com/modelcontextprotocol/registry","purl":"pkg:golang/github.com/modelcontextprotocol/registry","ranges":[">=1.1.0 <1.7.5"],"fixed":["1.7.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}