CVE-2026-44284 FastGPT: Stored MCP tool URL SSRF in FastGPT workflow execution
Authenticated users can store internal URLs in MCP tools, causing the backend to connect to internal services during workflow execution.
- 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-2026-44284?
CVE-2026-44284 is a medium-severity server-side request forgery vulnerability in labring FastGPT, published on 8 May 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 version 4.14.17, FastGPT had an inconsistent SSRF protection gap in MCP tool URL handling. The direct MCP preview/run endpoints already rejected internal/private network URLs, but the MCP tool create/update endpoints could still save an internal MCP server URL. That stored URL could later be used by workflow execution without revalidating the destination. An authenticated user with permission to create or manage MCP toolsets could store an internal endpoint such as http://localhost:3000/mcp and later cause the FastGPT backend workflow runner to connect to that internal destination. This issue has been patched in version 4.14.17.
Weakness: CWE-918
Which versions are affected by CVE-2026-44284?
How do I fix CVE-2026-44284?
No fix has been published for CVE-2026-44284 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-44284 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44284 exists.
Sources
Also known as GHSA-cxxj-99f7-f5wq.