CVE-2026-40252— Broken Access Control (IDOR) Leading to Cross-Tenant Application Access in FastGPT
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 4.14.10.4之前版本存在安全漏洞，该漏洞源于访问控制不当，任何经过身份验证的团队通过提供外部appId即可访问和执行属于其他团队的应用程序，可能导致跨租户数据暴露和未经授权的私有AI工作流执行。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-40252
Vulnerability Information
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Vulnerability Title
Broken Access Control (IDOR) Leading to Cross-Tenant Application Access in FastGPT
Source: CVE Program / CVE List V5
Vulnerability Description
FastGPT is an AI Agent building platform. Prior to 4.14.10.4, Broken Access Control vulnerability (IDOR/BOLA) allows any authenticated team to access and execute applications belonging to other teams by supplying a foreign appId. While the API correctly validates the team token, it does not verify that the requested application belongs to the authenticated team. This leads to cross-tenant data exposure and unauthorized execution of private AI workflows. This vulnerability is fixed in 4.14.10.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
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 4.14.10.4之前版本存在安全漏洞，该漏洞源于访问控制不当，任何经过身份验证的团队通过提供外部appId即可访问和执行属于其他团队的应用程序，可能导致跨租户数据暴露和未经授权的私有AI工作流执行。
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)
Affected Products
II. Public POCs for CVE-2026-40252
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Vendor Advisories for CVE-2026-40252 (1)
Vendor Pages for CVE-2026-40252 (1)
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Release v4.14.10.4 · labring/FastGPT · GitHub x_refsource_MISC
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V. Comments for CVE-2026-40252
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