CVE-2026-40351
FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
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.
INFO
Published Date :
April 17, 2026, 10:16 p.m.
Last Modified :
April 27, 2026, 7:39 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE |
Solution
- Update FastGPT to version 4.14.9.5.
- Apply available security patches immediately.
- Validate all user inputs rigorously.
Public PoC/Exploit Available at Github
CVE-2026-40351 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40351.
| URL | Resource |
|---|---|
| https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d | Patch |
| https://github.com/labring/FastGPT/releases/tag/v4.14.9.5 | Product Release Notes |
| https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40351 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40351
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A curated timeline of real AI agent security incidents, breaches, and vulnerabilities (2024-2026). Every entry sourced and dated.
ai-agent-security ai-agents ai-security awesome-list cybersecurity llm-security mcp-security prompt-injection supply-chain-security adversarial-attacks agent-security agentic-ai ai-attacks ai-safety cve incident-response owasp red-team security-research vulnerability
Cathedral-Grade Security for AI Agents. Attack vectors updated daily. Local-first, zero API cost. MIT licensed.
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40351 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40351 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:fastgpt:fastgpt:*:*:*:*:*:*:*:* versions up to (excluding) 4.14.9.5 Added Reference Type GitHub, Inc.: https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/labring/FastGPT/releases/tag/v4.14.9.5 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg Types: Exploit, Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Apr. 17, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-943 Added Reference https://github.com/labring/FastGPT/commit/bd966d479fbe414d02679cf79f9eaaab3d100a2d Added Reference https://github.com/labring/FastGPT/releases/tag/v4.14.9.5 Added Reference https://github.com/labring/FastGPT/security/advisories/GHSA-x8mx-2mr7-h9xg