CVE-2026-44284

MEDIUM 6.3

FastGPT: Stored MCP tool URL SSRF in FastGPT workflow execution

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	labring
Product	fastgpt
Published	May 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

labring / FastGPT

< 4.14.17

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/labring/FastGPT/security/advisories/GHSA-cxxj-99f7-f5wq github.com: https://github.com/labring/FastGPT/pull/6826 github.com: https://github.com/labring/FastGPT/commit/c1c6b9520d976d25ed945b5bc4e0768149e6db69 github.com: https://github.com/labring/FastGPT/releases/tag/v4.14.17