CVE-2026-40351

critical · 9.8

FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password-based login endpoint uses TypeScript type assertion without runtime validation, allowing an unauthenticated attacker to pass a MongoDB query operator object (e.g., {"$ne": ""}) as the password field. This NoSQL injection bypasses the password check, enabling login as any user including the root administrator. This issue has been fixed in version 4.14.9.5.

9.8

CVSS

0.6%

EPSS (exploit prob.)

49th

EPSS percentile

2026-04-17

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-943

Affected products

Vendor	Product	Affected versions
fastgpt	fastgpt	< 4.14.9.5

Check a specific version with /api/v1/cve/match.

References

https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d
https://github.com/labring/FastGPT/releases/tag/v4.14.9.5
https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-40351