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CVE-2026-44428— MCP Registry: GitHub OIDC tokens replayable across registry deployments due to shared audience

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 1.7.6之前版本存在代码问题漏洞，该漏洞源于客户端和服务器端GitHub OIDC流程仅绑定到全局受众字符串而非特定注册表实例，导致从一个注册表部署合法获取的令牌可被其他共享相同代码和受众字符串的部署接受。

AI Predicted 9.8 Difficulty: Easy EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
modelcontextprotocol registry < 1.7.6 affected
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I. Basic Information for CVE-2026-44428

Vulnerability Information
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Vulnerability Title
MCP Registry: GitHub OIDC tokens replayable across registry deployments due to shared audience
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. Prior to 1.7.6, the client-side and server-side GitHub OIDC flow is bound only to a global audience string, not to the specific registry instance being targeted. On the client side, the publisher always appends audience=mcp-registry when requesting the GitHub Actions ID token, regardless of the selected --registry URL. On the server side, the exchange endpoint validates only that same fixed audience and then derives publish permissions directly from repository_owner. As a result, a token legitimately obtained while interacting with one registry deployment remains acceptable to any other deployment that shares the same code and audience string. This vulnerability is fixed in 1.7.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Registry 代码问题漏洞
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 1.7.6之前版本存在代码问题漏洞，该漏洞源于客户端和服务器端GitHub OIDC流程仅绑定到全局受众字符串而非特定注册表实例，导致从一个注册表部署合法获取的令牌可被其他共享相同代码和受众字符串的部署接受。
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 < 1.7.6 -

II. Public POCs for CVE-2026-44428

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III. Intelligence Information for CVE-2026-44428

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Vendor Advisories for CVE-2026-44428 (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-2026-44427 MCP Registry: Open Redirect

IV. Related Vulnerabilities

Same product: registry
Same vendor: modelcontextprotocol
Same weakness: CWE-918

V. Comments for CVE-2026-44428

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