High severity · published Apr 10, 2026
CVE-2026-40252
Broken Access Control (IDOR) Leading to Cross-Tenant Application Access in FastGPT
8.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FA
FastGPT · labring
< 4.14.10.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40252
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40252
Release Notes
https://github.com/labring/FastGPT/releases/tag/v4.14.10.4
Vendor Advisory
https://github.com/labring/FastGPT/security/advisories/GHSA-gc8m-w37w-24hw
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