Server-Side Request Forgery Vulnerability in FrontMCP Framework by AgentFront
CVE-2026-39885

7.5HIGH

Key Information:

Vendor

Agentfront

Status
Frontmcp
Adapters
Sdk
Mcp-from-openapi
Vendor
CVE Published:
8 April 2026

What is CVE-2026-39885?

The FrontMCP framework suffers from a vulnerability due to the mcp-from-openapi library utilizing @apidevtools/json-schema-ref-parser without proper URL restrictions. This oversight allows malicious OpenAPI specifications to trigger requests to internal addresses, potentially leading to unauthorized access to sensitive resources or local file exposure during the initialization process. The vulnerability has been addressed in the version 2.3.0 update.

Affected Version(s)

adapters < 1.0.4

frontmcp < 1.0.4

mcp-from-openapi < 2.3.0

References

https://github.com/agentfront/frontmcp/security/advisorie...
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https://github.com/agentfront/frontmcp/releases/tag/v1.0.4
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.