CVE-2026-40252
Received Received - Intake
Broken Access Control in FastGPT API Enables Cross-Tenant Access

Publication date: 2026-04-10

Last updated on: 2026-04-21

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-04-10
Last Modified
2026-04-21
Generated
2026-06-16
AI Q&A
2026-04-11
EPSS Evaluated
2026-06-14
NVD
CVE-2026-40252
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
fastgpt fastgpt to 4.14.10.4 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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Executive Summary

This vulnerability is a Broken Access Control issue (specifically IDOR/BOLA) in FastGPT, an AI Agent building platform. Before version 4.14.10.4, any authenticated team could access and execute applications that belong to other teams by providing a foreign application ID (appId). Although the API validates the team token, it does not verify whether the requested application actually belongs to the authenticated team. This flaw allows unauthorized cross-tenant data exposure and execution of private AI workflows.

Impact Analysis

The vulnerability can lead to unauthorized access to other teams' applications and data within the FastGPT platform. This means that sensitive or private AI workflows and data from other teams can be exposed or executed without permission, potentially leading to data breaches, loss of confidentiality, and misuse of AI resources.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade FastGPT to version 4.14.10.4 or later, where the Broken Access Control issue has been fixed.

Compliance Impact

The vulnerability allows cross-tenant data exposure and unauthorized execution of private AI workflows by enabling any authenticated team to access applications belonging to other teams. This unauthorized access to data and workflows can lead to violations of data protection and privacy requirements commonly mandated by standards and regulations such as GDPR and HIPAA.

Specifically, the exposure of private data across tenants may result in non-compliance with regulations that require strict access controls and data segregation to protect personal and sensitive information.

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