{"id":"EUVD-2026-78782","revision":"b006ff735b464bd4af09fa7a2c9e6e4e","records":[{"revision":"b006ff735b464bd4af09fa7a2c9e6e4e","observedAt":"2026-11-09T14:08:47.116+00:00","statement":{"source":"euvd","id":"EUVD-2026-78782","aliases":["CVE-2026-59973","GHSA-65h7-9wrw-629c"],"title":"FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec(…","description":"FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). From mcp-from-openapi 2.3.0 until 2.5.0 and from frontmcp and @frontmcp/adapters 1.2.1 until 1.5.0, libs/adapters/src/openapi/openapi.adapter.ts loadOpenAPISpec() forwards untrusted OpenAPI url and spec inputs and loadOptions.refResolution to OpenAPIToolGenerator.fromURL() and OpenAPIToolGenerator.fromJSON(). The external $ref guard checks parsed hostname strings without resolving addresses, pinning validated addresses, revalidating redirect targets, or normalizing IPv4-mapped IPv6. An authenticated user who can import or configure an OpenAPI specification in a hosted or multi-user deployment can use DNS-to-loopback resolution, redirect-to-loopback behavior, or IPv4-mapped IPv6 loopback forms to cause backend-origin requests to internal services. This can expose internal administrative APIs, metadata-like services, and other private network endpoints. The practical impact is lower when only a trusted local administrator can configure OpenAPI specs, and disabling external reference protocols prevents the external $ref request. This issue is fixed in mcp-from-openapi 2.5.0 and frontmcp and @frontmcp/adapters 1.5.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","score":8.5,"severity":null}],"references":["https://github.com/agentfront/frontmcp/security/advisories/GHSA-65h7-9wrw-629c","https://github.com/agentfront/frontmcp/pull/496","https://github.com/agentfront/mcp-from-openapi/pull/7","https://github.com/agentfront/frontmcp/commit/96a78eaa5c6c4bc51cced557d83d1a03344cb03d","https://github.com/agentfront/mcp-from-openapi/commit/be3409cce6e97642696d4ee5a4e4e2712490b277","https://github.com/agentfront/frontmcp/releases/tag/v1.5.0","https://github.com/agentfront/mcp-from-openapi/releases/tag/v2.5.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78782","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 15, 2026, 3:13:40 PM","dateUpdated":"Sep 16, 2026, 4:06:53 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-78782","identifiers":["EUVD-2026-78782","CVE-2026-59973","GHSA-65h7-9wrw-629c"]},"retained":false,"historicalAffected":[]}],"coverage":[]}