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

AI Predicted 9.8 Difficulty: Easy EPSS 0.04% · P13

Possible ATT&CK Techniques 1AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProductVersion RangeStatus
modelcontextprotocolregistry< 1.7.6affected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
modelcontextprotocolregistry < 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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Same Patch Batch · modelcontextprotocol · 2026-05-14 · 6 CVEs total

CVE-2026-425598.8 HIGHRMCP: DNS rebinding vulnerability in rmcp Streamable HTTP server transport
CVE-2026-457813.5 LOWMCP Registry: OCI ownership validation fails open on upstream rate limits, allowing attack
CVE-2026-44429MCP Registry: Stored XSS in catalogue UI via attribute-quote breakout in publisher-control
CVE-2026-44430MCP Registry: Unauthenticated SSRF: HTTP namespace verification dials 6to4 / NAT64 / site-
CVE-2026-44427MCP 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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