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.
History

Sun, 17 May 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Modelcontextprotocol
Modelcontextprotocol registry
Vendors & Products Modelcontextprotocol
Modelcontextprotocol registry

Fri, 15 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title MCP Registry: Open Redirect
Weaknesses CWE-601
References
Metrics cvssV4_0

{'score': 0, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-14T21:07:34.364Z

Updated: 2026-05-15T13:33:16.949Z

Reserved: 2026-05-06T14:40:00.953Z

Link: CVE-2026-44427

cve-icon Vulnrichment

Updated: 2026-05-15T13:33:00.617Z

cve-icon NVD

Status : Deferred

Published: 2026-05-14T22:16:44.450

Modified: 2026-05-15T15:16:52.670

Link: CVE-2026-44427

cve-icon Redhat

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