CVE-2026-40100: Fastgpt

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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

• Fastgpt Fastgpt: before 4.14.10.3 (fixed in 4.14.10.3)

Published 2026-04-10. Last modified 2026-06-17.