CVE-2026-44284: CWE-918: Server-Side Request Forgery (SSRF) in labring FastGPT
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.
AI Analysis
Technical Summary
FastGPT, an AI Agent building platform by labring, had an SSRF vulnerability (CWE-918) in versions before 4.14.17. While direct MCP preview/run endpoints blocked internal/private network URLs, the MCP tool create/update endpoints allowed storing internal URLs without validation. This stored URL could later be used during workflow execution, enabling an authenticated user with MCP toolset management permissions to make the backend connect to internal endpoints such as http://localhost:3000/mcp. This inconsistency in SSRF protection was patched in version 4.14.17.
Potential Impact
An authenticated user with permission to create or manage MCP toolsets could exploit this vulnerability to make the FastGPT backend workflow runner connect to internal or private network endpoints. This could potentially lead to unauthorized access or interaction with internal services. The impact includes limited confidentiality, integrity, and availability consequences as indicated by the CVSS vector (C:L/I:L/A:L). There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade FastGPT to version 4.14.17 or later, where this SSRF vulnerability has been patched. Since this is not a cloud service, users must apply the update themselves. Patch status is not explicitly stated beyond the version fix, so verify with the vendor for any additional guidance.
CVE-2026-44284: CWE-918: Server-Side Request Forgery (SSRF) in labring FastGPT
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.
CVSS v3.1
Score 6.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
FastGPT, an AI Agent building platform by labring, had an SSRF vulnerability (CWE-918) in versions before 4.14.17. While direct MCP preview/run endpoints blocked internal/private network URLs, the MCP tool create/update endpoints allowed storing internal URLs without validation. This stored URL could later be used during workflow execution, enabling an authenticated user with MCP toolset management permissions to make the backend connect to internal endpoints such as http://localhost:3000/mcp. This inconsistency in SSRF protection was patched in version 4.14.17.
Potential Impact
An authenticated user with permission to create or manage MCP toolsets could exploit this vulnerability to make the FastGPT backend workflow runner connect to internal or private network endpoints. This could potentially lead to unauthorized access or interaction with internal services. The impact includes limited confidentiality, integrity, and availability consequences as indicated by the CVSS vector (C:L/I:L/A:L). There are no known exploits in the wild at this time.
Mitigation Recommendations
Upgrade FastGPT to version 4.14.17 or later, where this SSRF vulnerability has been patched. Since this is not a cloud service, users must apply the update themselves. Patch status is not explicitly stated beyond the version fix, so verify with the vendor for any additional guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-05T17:39:31.112Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fe61e5cbff5d8610367fb8
Added to database: 05/08/2026, 22:21:25 UTC
Last enriched: 05/16/2026, 10:54:00 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 114
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