CVE-2026-44427
MEDIUM SEVERITYVulnerability 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.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-601
Source
GitHub
Vendor
go
Product
github.com/modelcontextprotocol/registry
External References
- https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6
- https://github.com/modelcontextprotocol/registry/pull/1227
- https://github.com/modelcontextprotocol/registry/commit/1201cbd82b2cf6d4b56edfc05c763059a12f9fdb
- https://github.com/modelcontextprotocol/registry/releases/tag/v1.7.5
- https://github.com/advisories/GHSA-v8vw-gw5j-w7m6
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