CVE-2026-40351
CRITICAL
NVD
CVSS Score
9.8
Severity
CRITICAL
Published
Apr 17, 2026
Vendor
unknown
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.