EUVD-2026-21507
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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3Description
FastGPT is an AI Agent building platform. Prior to 4.14.10.3, the /api/core/app/mcpTools/runTool endpoint accepts arbitrary URLs without authentication. The internal IP check in isInternalAddress() only blocks private IPs when CHECK_INTERNAL_IP=true, which is not the default. This allows unauthenticated attackers to perform SSRF against internal network resources. This vulnerability is fixed in 4.14.10.3.
Analysis
Server-side request forgery (SSRF) in FastGPT versions prior to 4.14.10.3 allows unauthenticated remote attackers to probe and access internal network resources via the /api/core/app/mcpTools/runTool endpoint, which accepts arbitrary URLs without proper validation. The vulnerability is exploitable by default because the internal IP check is gated behind a disabled configuration flag (CHECK_INTERNAL_IP=false), enabling attackers to bypass network segmentation and potentially discover or interact with backend services, databases, or cloud metadata endpoints.
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