CVE-2026-34163 Details
Description
FastGPT is an AI Agent building platform. Prior to version 4.14.9.5, FastGPT's MCP (Model Context Protocol) tools endpoints (/api/core/app/mcpTools/getTools and /api/core/app/mcpTools/runTool) accept a user-supplied URL parameter and make server-side HTTP requests to it without validating whether the URL points to an internal/private network address. Although the application has a dedicated isInternalAddress() function for SSRF protection (used in other endpoints like the HTTP workflow node), the MCP tools endpoints do not call this function. An authenticated attacker can use these endpoints to scan internal networks, access cloud metadata services, and interact with internal services such as MongoDB and Redis. This issue has been patched in version 4.14.9.5.
A server-side request forgery (SSRF) vulnerability has been identified in FastGPT versions prior to 4.14.9.5. The issue resides in the Model Context Protocol (MCP) tools endpoints, which accept user-supplied URL parameters and make server-side HTTP requests without validating whether the URLs point to internal or private network addresses. This oversight allows authenticated attackers to scan internal networks, access cloud metadata services, and interact with internal databases such as MongoDB and Redis.
Users can update to FastGPT version 4.14.9.5 or later, where this vulnerability has been patched. For additional security, implement URL allowlisting for MCP server URLs at the application configuration level and use network-level controls to restrict outbound traffic from the FastGPT container.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 31, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/labring/FastGPT/commit/bc7eae2ed61481a5e322208829be291faec58c00 | [email protected] | Patch |
| https://github.com/labring/FastGPT/pull/6640 | [email protected] | Issue TrackingPatch |
| https://github.com/labring/FastGPT/releases/tag/v4.14.9.5 | [email protected] | ProductRelease Notes |
| https://github.com/labring/FastGPT/security/advisories/GHSA-x9vj-5m4j-9mfv | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| fastgpt fastgpt | < 4.14.9.5 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 1, 2026 | Initial Analysis | [email protected] |
| Mar 31, 2026 | New CVE Received | [email protected] |