What is CVE-2026-40252?

CVE-2026-40252 is a high-severity vulnerability in Fastgpt, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-04-10.

How severe is CVE-2026-40252?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Fastgpt

CVE-2026-40252

FastGPT is an AI Agent building platform. Prior to 4.14.10.4, Broken Access Control vulnerability (IDOR/BOLA) allows any authenticated team to access and execute applications belonging to other teams by supplying a foreign appId. While the…

EPSS: 0.003 (26.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Fastgpt
Labring Fastgpt — versions < 4.14.10.4

Weakness classification (CWE)

CWE-284 — Improper Access Control
CWE-639 — Authorization Bypass Through User-Controlled Key

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-40252?: CVE-2026-40252 is a high-severity vulnerability in Fastgpt, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-04-10.
How severe is CVE-2026-40252?: High severity. CVSS v3 base score is 8.1 out of 10.