CVE-2026-40351— FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
Quick assessment
Affected
labring FastGPT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FastGPT是labring开源的一款基于大语言模型的开源知识库问答系统。 FastGPT 4.14.9.5之前版本存在安全漏洞，该漏洞源于基于密码的登录端点使用TypeScript类型断言而缺少运行时验证，可能导致未经身份验证的攻击者传递MongoDB查询运算符对象。
Possible ATT&CK Techniques 2 AI
T1110.004 · Credential Stuffing T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40351
Vulnerability Information
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Vulnerability Title
FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
FastGPT 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastGPT是labring开源的一款基于大语言模型的开源知识库问答系统。 FastGPT 4.14.9.5之前版本存在安全漏洞，该漏洞源于基于密码的登录端点使用TypeScript类型断言而缺少运行时验证，可能导致未经身份验证的攻击者传递MongoDB查询运算符对象。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
II. Public POCs for CVE-2026-40351
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-40351 (1)
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V. Comments for CVE-2026-40351
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