Description
FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.
Problem types
CWE-918: Server-Side Request Forgery (SSRF)
Product status
References
github.com/...ontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj
github.com/...ontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj
github.com/agentfront/frontmcp/releases/tag/v1.0.4