FastGPT Authentication and SSRF Flaws

Unauthenticated HTTP proxy abuse in FastGPT (AI Agent platform) prior to v4.14.9.5 allows remote attackers to relay arbitrary HTTP requests through the server. The /api/core/app/httpTools/runTool endpoint accepts user-controlled URLs, methods, headers, and body parameters without authentication, functioning as an open proxy for network pivoting, credential theft, and internal network reconnaissance. CVSS 10.0 (Critical) with network attack vector and no privileges required. No public exploit identified at time of analysis, though exploitation is trivial given the exposed endpoint design. EPSS data not available.

Server-Side Request Forgery (SSRF) in FastGPT's Model Context Protocol (MCP) tools endpoints allows authenticated attackers to probe internal networks, access cloud metadata services (e.g., AWS/GCP instance credentials), and interact with backend databases like MongoDB and Redis. Affects FastGPT versions prior to 4.14.9.5. The vulnerability has CVSS 7.7 (High) with scope change indicating potential lateral movement to other system components. EPSS data not available; no confirmed active exploitation (not in CISA KEV). Public exploit code exists via GitHub security advisory GHSA-x9vj-5m4j-9mfv with technical details and proof-of-concept guidance.