CVE-2026-40351 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-10 | Published 2026-04-17 | Updated 2026-04-20 | Assigner GitHub_M

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-943: Improper Neutralization of Special Elements in Data Query Logic

Product status

< 4.14.9.5

affected

References

github.com/...astGPT/security/advisories/GHSA-x8mx-2mr7-h9xg

github.com/...ommit/bd966d479fbe414d02679cf79f9eaaab3d100a2d

github.com/labring/FastGPT/releases/tag/v4.14.9.5

cve.org (CVE-2026-40351)

nvd.nist.gov (CVE-2026-40351)

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