What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-17 · updated 2026-10-26
• Weakness: CWE-943

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

• labring FastGPT: before 4.14.9.5 — fixed in 4.14.9.5

How to fix

Upgrade to a fixed version: labring FastGPT 4.14.9.5. Check the vendor advisory for mitigations.

References

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

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