Is CVE-2026-40100 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-40100, but active exploitation has not been confirmed.

Can CVE-2026-40100 be exploited remotely?

Yes. CVE-2026-40100 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40100?

CVE-2026-40100 has a CVSS score of 5.3 (MEDIUM).

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MEDIUMPOC

CVE-2026-40100

CWE-918Published: April 10, 2026· Updated: Apr 15, 2026

5.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-40100 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A proof-of-concept (PoC) exploit exists for CVE-2026-40100. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.