CVE-2026-40351

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.

• CWE-943

• https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2dPatch
• https://github.com/labring/FastGPT/releases/tag/v4.14.9.5Product, Release Notes
• https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xgExploit, Mitigation, Vendor Advisory

Published

Apr 17, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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