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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

FrontMCP SSRF and local file read via unrestricted OpenAPI $ref dereferencing (CVE-2026-39885)

Versions of the FrontMCP framework prior to 2.3.0 dereferenced $ref pointers in OpenAPI specifications via @apidevtools/json-schema-ref-parser without URL restrictions or custom resolvers, so a malicious spec could make the server fetch internal addresses, cloud metadata endpoints or local files during initialize(). The issue enables server-side request forgery and local file read and is fixed in version 2.3.0.

Disclosed 8 April 2026 · Record updated 13 September 2026

Impact

Processing an untrusted OpenAPI specification can trigger server-side request forgery against internal network or cloud metadata endpoints and read local files on the host running the MCP server.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-39885