CVE-2026-40351— FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: NVD (National Vulnerability Database)
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
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IV. Related Vulnerabilities
Same product: FastGPT
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FastGPT: Uncontrolled Resource Consumption leading to Sandbo
Same vendor: labring
- CVE-2026-44286
FastGPT: SSRF Vulnerability in Laf Workflow Node via Missing - CVE-2026-44284
FastGPT: Stored MCP tool URL SSRF in FastGPT workflow execut - CVE-2026-42345
FastGPT: Cloud metadata endpoint SSRF protection bypass via - CVE-2026-42344
FastGPT: DNS rebinding TOCTOU bypass in isInternalAddress al - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo
Same weakness: CWE-943
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V. Comments for CVE-2026-40351
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