{"id":"CVE-2026-44427","summary":"MCP Registry: Open Redirect","details":"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.","aliases":["GHSA-v8vw-gw5j-w7m6","GO-2026-5658"],"modified":"2026-07-08T08:13:28.159164198Z","published":"2026-05-14T21:07:34.364Z","related":["CGA-c9cm-rv2q-j4x3"],"database_specific":{"cwe_ids":["CWE-601"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44427.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44427.json"},{"type":"ADVISORY","url":"https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44427"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/modelcontextprotocol/registry","events":[{"introduced":"ae00f70eaf2202970d74f5d459fd174ab8445a8a"},{"fixed":"1201cbd82b2cf6d4b56edfc05c763059a12f9fdb"}],"database_specific":{"extracted_events":[{"introduced":"1.1.0"},{"fixed":"1.7.5"}],"source":"AFFECTED_FIELD"}}],"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"}}],"schema_version":"1.7.5","severity":[{"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"}]}