CVE-2026-44427
Unknown
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.
SeverityUnknown
CVSS0.0
Exploit probability—
ProductGithub.com/modelcontextprotocol/registry
PublishedMay 14, 2026
First seenMay 14, 2026
Weakness typeCWE-601Open redirect
How to fix
Update
- github.com/modelcontextprotocol/registry1.7.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/modelcontextprotocol/registryGo | 1.1.0 ≤ v < 1.7.5 | 1.7.5 |
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