rmcp OAuth client fetches server-controlled resource_metadata URLs

Summary The rmcp OAuth client accepts a server-controlled resourcemetadata= URL from the WWW-Authenticate header and fetches it without same-origin or private-network validation. An attacker-controlled MCP server can return a 401 WWW-Authenticate: Bearer resourcemetadata="..." header pointing at ...

GHSA-C9XM-49CP-XCR9 rmcp OAuth client fetches server-controlled resource_metadata URLs

Summary The rmcp OAuth client accepts a server-controlled resourcemetadata= URL from the WWW-Authenticate header and fetches it without same-origin or private-network validation. An attacker-controlled MCP server can return a 401 WWW-Authenticate: Bearer resourcemetadata="..." header pointing at ...

CVE-2026-51994

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

EUVD-2026-86017

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

CVE-2026-51994: Server-Side Request Forgery (SSRF)

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

CVE-2026-51994

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

CVE-2026-51994

Versions 0.1.32 through 0.1.38 of mcp-remote are vulnerable to Server-Side Request Forgery (SSRF) . The root cause is the insecure processing of the resource_metadata URL extracted from a remote MCP server's WWW-Authenticate header . This vulnerability allows an attacker to potentially force the ...

CVE-2026-51994

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

CVE-2026-51994

mcp-remote versions 0.1.32 through 0.1.38 are vulnerable to Server-Side Request Forgery SSRF via the resourcemetadata URL extracted from a remote MCP server's WWW-Authenticate header...

CVE-2026-58196

ToolHive (a utility for deploying Model Context Protocol (MCP) servers) is vulnerable to SSRF in its remote MCP server authentication discovery. Prior to 0.31.0 , the host-side HTTP clients in pkg/auth/discovery trust server-controlled resource_metadata URLs from the WWW-Authenticate header, foll...