CVE-2026-44284
MEDIUMFastGPT: Stored MCP tool URL SSRF in FastGPT workflow execution
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/labring/FastGPT/commit/c1c6b9520d976d25ed945b5bc4e0768149e6db69
X_Refsource_Misc x_refsource_misc
https://github.com/labring/FastGPT/releases/tag/v4.14.17
X_Refsource_Confirm x_refsource_confirm
https://github.com/labring/FastGPT/security/advisories/GHSA-cxxj-99f7-f5wq
X_Refsource_Misc x_refsource_misc
https://github.com/labring/FastGPT/pull/6826
Scores
CVSS v3
6.3
EPSS
0.0024
EPSS Percentile
14.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-918
Status
published
Products (1)
labring/FastGPT
< 4.14.17
Published
May 08, 2026
Tracked Since
May 09, 2026