CVE-2026-44427 Details
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.
A vulnerability allowing open redirect attacks has been identified in the MCP Registry, specifically in versions 1.1.0 prior to 1.7.5. The issue arises in the TrailingSlashMiddleware, located in internal/api/server.go, which fails to properly validate URLs before redirecting. This allows attackers to craft URLs that, after being processed by the middleware, are interpreted by browsers as absolute URLs to external domains. The vulnerability could be exploited by sending a request with a double-slash path followed by an external domain, which would then be redirected to that domain.
Users can update to MCP Registry version 1.7.5 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 14, 2026CISA-ADP
Assessed May 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/modelcontextprotocol/registry/security/advisories/GHSA-v8vw-gw5j-w7m6 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ModelContextProtocol MCP Registry | All versions |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | New CVE Received | [email protected] |