What’s Vulnerable › Vulnerabilities

CVE-2026-44427: MCP Registry: Open Redirect

• Severity: none (CVSS 0.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-14 · updated 2026-10-26
• Weakness: CWE-601

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.

Affected products

• modelcontextprotocol registry: from 1.1.0, < 1.7.5

References

• https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6
• https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6

Get alerted when CVE-2026-44427 or the next vulnerability affects your stack