CVE-2026-40100CWE-918

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

Medium · published April 10, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
32.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00397 · 32.8th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-04-10T16:39Z
EPSS history
Timeline
  • 10 APR 16:39Z
    FastGPT has Unauthenticated SSRF in /api/core/app/mcpTools/runTool via missing CHECK_INTERNAL_IP default
    cvelistv5