Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M

CVE-2026-40351FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass

Critical 9.8

In plain English

A critical-severity security flaw in FastGPT from labring. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.6%top 49.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
labring	FastGPT	< 4.14.9.5

Weakness: CWE-943 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

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