CVE-2026-44284Public exploitNetwork attack vector

Authenticated internal network access via stored MCP URLs

Published May 8, 2026 · Updated May 8, 2026

Server-side request forgery in FastGPT before 4.14.17 allows remote authenticated users to reach internal services through MCP workflows. The MCP tool create and update handlers persist internal URLs without applying isInternalAddress, and workflow dispatch constructs MCPClient instances from those stored URLs without revalidation. MCP toolset management permission is required; the resulting backend connection can expose or affect only services reachable from the FastGPT deployment.

CVSS severity6.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in FastGPT before 4.14.17 allows remote authenticated users to reach internal services through MCP workflows. The MCP tool create and update handlers persist internal URLs without applying isInternalAddress, and workflow dispatch constructs MCPClient instances from those stored URLs without revalidation. MCP toolset management permission is required; the resulting backend connection can expose or affect only services reachable from the FastGPT deployment.

The record

CVE
CVE-2026-44284
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Labring
Product
FastGPT
Classifications
CWE-918
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.14.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Labring · FastGPTversion=< 4.14.17

Published CVSS scores

6.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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