CVE-2026-40351

CRITICAL 9.8

FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-943
Vendor	labring
Product	fastgpt
Published	Apr 17, 2026

Stay Ahead of the Next One

Get instant alerts for labring fastgpt

Be the first to know when new critical vulnerabilities affecting labring fastgpt are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

labring / FastGPT

< 4.14.9.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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