CVE-2026-40252: CWE-284: Improper Access Control in labring FastGPT
CVE-2026-40252 is a broken access control vulnerability in labring's FastGPT AI Agent building platform versions prior to 4. 14. 10. 4. It allows any authenticated team to access and execute applications belonging to other teams by supplying a foreign application ID (appId). The API validates the team token but does not verify ownership of the requested application, resulting in unauthorized cross-tenant data exposure and execution of private AI workflows. This vulnerability has a medium severity with a CVSS score of 5. 3 and is fixed in version 4. 14. 10.
AI Analysis
Technical Summary
FastGPT versions before 4.14.10.4 suffer from an improper access control vulnerability (CWE-284, CWE-639) where the API fails to verify that an application requested by an authenticated team actually belongs to that team. This allows an authenticated user to supply a foreign appId and gain unauthorized access to and execution rights over applications of other teams, leading to cross-tenant data exposure and unauthorized AI workflow execution. The issue is resolved in FastGPT version 4.14.10.4.
Potential Impact
Exploitation of this vulnerability enables authenticated users to access and execute applications belonging to other teams, causing unauthorized exposure of private data and AI workflows across tenants. This breaks tenant isolation and can lead to confidentiality breaches and unauthorized operations within the platform.
Mitigation Recommendations
Upgrade FastGPT to version 4.14.10.4 or later, where this broken access control vulnerability is fixed. No other mitigation is indicated or required according to the available data.
CVE-2026-40252: CWE-284: Improper Access Control in labring FastGPT
Description
CVE-2026-40252 is a broken access control vulnerability in labring's FastGPT AI Agent building platform versions prior to 4. 14. 10. 4. It allows any authenticated team to access and execute applications belonging to other teams by supplying a foreign application ID (appId). The API validates the team token but does not verify ownership of the requested application, resulting in unauthorized cross-tenant data exposure and execution of private AI workflows. This vulnerability has a medium severity with a CVSS score of 5. 3 and is fixed in version 4. 14. 10.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
FastGPT versions before 4.14.10.4 suffer from an improper access control vulnerability (CWE-284, CWE-639) where the API fails to verify that an application requested by an authenticated team actually belongs to that team. This allows an authenticated user to supply a foreign appId and gain unauthorized access to and execution rights over applications of other teams, leading to cross-tenant data exposure and unauthorized AI workflow execution. The issue is resolved in FastGPT version 4.14.10.4.
Potential Impact
Exploitation of this vulnerability enables authenticated users to access and execute applications belonging to other teams, causing unauthorized exposure of private data and AI workflows across tenants. This breaks tenant isolation and can lead to confidentiality breaches and unauthorized operations within the platform.
Mitigation Recommendations
Upgrade FastGPT to version 4.14.10.4 or later, where this broken access control vulnerability is fixed. No other mitigation is indicated or required according to the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-10T17:31:45.786Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d9662c1cc7ad14dae9687b
Added to database: 4/10/2026, 9:05:48 PM
Last enriched: 4/10/2026, 9:20:44 PM
Last updated: 4/10/2026, 11:25:58 PM
Views: 5
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