Server-Side Request Forgery via MCP Tools Endpoint in FastGPT

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Summary

CVECVE-2026-34163
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 15:16:17 UTC
Updated2026-04-01 18:28:47 UTC
DescriptionFastGPT 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

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

EPSS: 0.000280000 probability, percentile 0.077360000 (date 2026-04-01)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Fastgpt Fastgpt All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Labring FastGPT affected < 4.14.9.5 Not specified

References

ReferenceSourceLinkTags
github.com/labring/FastGPT/pull/6640 [email protected] github.com Issue Tracking, Patch
github.com/labring/FastGPT/releases/tag/v4.14.9.5 [email protected] github.com Product, Release Notes
github.com/labring/FastGPT/security/advisories/GHSA-x9vj-5m4j-9mfv [email protected] github.com Exploit, Mitigation, Vendor Advisory
github.com/labring/FastGPT/commit/bc7eae2ed61481a5e322208829be291faec58c00 [email protected] github.com Patch
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