# CVE-2026-40351

## Summary

- **CVE ID:** CVE-2026-40351
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-943
- **Published:** Apr 17, 2026
- **Last Modified:** Apr 20, 2026

## 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 (< 4.14.9.5)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.63%
- **EPSS Percentile:** 48.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._