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CVE-2026-40351 - Vulnerability Analysis

CriticalCVSS: 9.8

Last Updated: April 17, 2026

FastGPT - Authentication Bypass

Published: April 17, 2026Updated: April 17, 2026Remote Exploitable

Overview

FastGPT < 4.14.9.5 contains a NoSQL injection caused by lack of runtime validation on password field in the login endpoint, letting unauthenticated attackers bypass password checks and login as any user.

Severity & Score

Severity: Critical

CVSS Score: 9.8

Impact

Unauthenticated attackers can bypass authentication and login as any user, including root administrator, leading to full system compromise.

Mitigation

Upgrade to version 4.14.9.5 or later.

References

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

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Details

CVE ID: CVE-2026-40351
Severity: Critical
CVSS Score: 9.8
Type: nosql_injection
Status: new

CWE

CWE-943

CVSS Metrics

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