What is CVE-2026-40100?

CVE-2026-40100 is a medium-severity vulnerability in Labring Fastgpt, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-04-10.

How severe is CVE-2026-40100?

Medium severity. CVSS v3 base score is 5.3 out of 10.

SSRF in Labring Fastgpt

CVE-2026-40100

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_INTERN…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.001 (19.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Labring Fastgpt — versions < 4.14.10.3

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/labring/FastGPT/security/advisories/GHSA-jrhc-f3j7-f8g4 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-40100?: CVE-2026-40100 is a medium-severity vulnerability in Labring Fastgpt, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-04-10.
How severe is CVE-2026-40100?: Medium severity. CVSS v3 base score is 5.3 out of 10.