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CVE-2026-44427— MCP Registry: Open Redirect

Quick assessment

Affected
modelcontextprotocol registry
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Registry是Model Context Protocol开源的一个MCP服务器应用商店。 MCP Registry 1.1.0至1.7.4版本存在输入验证错误漏洞，该漏洞源于TrailingSlashMiddleware存在开放重定向攻击，攻击者可构造协议相对路径的URL，在移除尾部斜杠后生成Location头为//evil.com，浏览器将其解释为外部域绝对URL。

AI Predicted 6.1 Difficulty: Easy EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
modelcontextprotocol registry >= 1.1.0, < 1.7.5 affected
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I. Basic Information for CVE-2026-44427

Vulnerability Information
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Vulnerability Title
MCP Registry: Open Redirect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Registry 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Registry是Model Context Protocol开源的一个MCP服务器应用商店。 MCP Registry 1.1.0至1.7.4版本存在输入验证错误漏洞，该漏洞源于TrailingSlashMiddleware存在开放重定向攻击，攻击者可构造协议相对路径的URL，在移除尾部斜杠后生成Location头为//evil.com，浏览器将其解释为外部域绝对URL。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol registry >= 1.1.0, < 1.7.5 -

II. Public POCs for CVE-2026-44427

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III. Intelligence Information for CVE-2026-44427

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Vendor Advisories for CVE-2026-44427 (1)

Same Patch Batch · modelcontextprotocol · 2026-05-14 · 6 CVEs total

CVE-2026-42559 8.8 HIGH RMCP: DNS rebinding vulnerability in rmcp Streamable HTTP server transport
CVE-2026-45781 3.5 LOW MCP Registry: OCI ownership validation fails open on upstream rate limits, allowing attack
CVE-2026-44429 MCP Registry: Stored XSS in catalogue UI via attribute-quote breakout in publisher-control
CVE-2026-44430 MCP Registry: Unauthenticated SSRF: HTTP namespace verification dials 6to4 / NAT64 / site-
CVE-2026-44428 MCP Registry: GitHub OIDC tokens replayable across registry deployments due to shared audi

IV. Related Vulnerabilities

Same product: registry
Same vendor: modelcontextprotocol
Same weakness: CWE-601

V. Comments for CVE-2026-44427

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