CVE-2026-40252 Broken Access Control (IDOR) Leading to Cross-Tenant Application Access in FastGPT
Authenticated users can access and execute other teams' private AI applications by manipulating application IDs, leading to cross-tenant data exposure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40252?
CVE-2026-40252 is a medium-severity missing authorization vulnerability in labring FastGPT, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-40252?
It affects 1 product.
Products include Fastgpt Fastgpt.
How do I fix CVE-2026-40252?
No fix has been published for CVE-2026-40252 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-40252 being exploited?
There is no known exploitation of CVE-2026-40252 in the wild and no public exploit code.
Other vulnerabilities in labring FastGPT
- CVE-2026-34162 FastGPT: Unauthenticated SSRF via httpTools Endpoint Leads to Internal API Key Theft
- CVE-2026-40351 FastGPT: NoSQL Injection in loginByPassword leads to Authentication Bypass
- CVE-2026-33075 FastGPT has Arbitrary Code Execution in GitHub Actions via pull_request_target in fastgpt-preview-image.yml
- CVE-2026-40352 FastGPT: NoSQL Injection in updatePasswordByOld Leads to Account Takeover
- CVE-2026-34163 Server-Side Request Forgery via MCP Tools Endpoint in FastGPT
Sources
Also known as GHSA-gc8m-w37w-24hw.