CriticalVulnerability

CVE-2026-40351: FastGPT NoSQL injection in password-based login endpoint

Source: NVD(opens in a new tab)
Identifier: CVE-2026-40351
Published: April 17, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.6%

Summary

CVE-2026-40351 affects FastGPT, 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, so an unauthenticated attacker can submit a MongoDB query operator object such as {"$ne": ""} as the password field. This NoSQL injection bypasses the password check and allows login as any user, including the root administrator.

Mitigation

This issue has been fixed in version 4.14.9.5.

Details

Scores and exploitation

CVSS score: 9.8(critical)
CVSS vector: 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
EPSS: 0.6%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 22, 2026.
Disclosure date: April 17, 2026

Weaknesses and techniques

Weakness (CWE): CWE-943

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: API
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-40351

First tracked: April 17, 2026 at 08:10 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Topics

AI agents

Summary

Mitigation

Topics

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