Arbitrary URL Access Vulnerability in FastGPT AI Agent Platform
CVE-2026-40100

5.3MEDIUM

Key Information:

Vendor

Labring

Status
Fastgpt
Vendor
CVE Published:
10 April 2026

What is CVE-2026-40100?

FastGPT, an AI Agent building platform, contains a vulnerability that allows unauthenticated users to access arbitrary URLs via the /api/core/app/mcpTools/runTool endpoint. This weakness arises because the internal IP check only restricts access to private IPs when the configuration parameter CHECK_INTERNAL_IP is set to true—something that is not enabled by default. As a result, this could lead to malicious actors executing SSRF attacks against internal network resources. The issue has been resolved in version 4.14.10.3.

Affected Version(s)

FastGPT < 4.14.10.3

References

https://github.com/labring/FastGPT/security/advisories/GH...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.