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OpenAdvisories
Medium · 5.3 CVE-2026-40100 EUVD-2026-21507

FastGPT has Unauthenticated SSRF in /api/core/app/mcpTools/runTool via missing CHECK_INTERNAL_IP default

Published Apr 10, 2026 · Updated Apr 15, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
labring FastGPT < 4.14.10.3 —

References