CVE-2026-39885

Published: Apr 08, 2026 Last Modified: Apr 15, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none

Description

AI Translation Available

FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0003
Percentile
0,1th
Updated

EPSS Score Trend (Last 8 Days)

918

Server-Side Request Forgery (SSRF)

Incomplete
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Access Control
Potential Impacts:
Read Application Data Execute Unauthorized Code Or Commands Bypass Protection Mechanism
Applicable Platforms
Technologies: AI/ML, Web Based, Web Server
View CWE Details
Application

Frontmcp by Agentfront

Product Information
Vendor Agentfront
Product Frontmcp
Version Range Affected
To 1.0.4 (exclusive)
cpe:2.3:a:agentfront:frontmcp:*:*:*:*:*:node.js:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

\@Frontmcp\/Sdk by Agentfront

Product Information
Vendor Agentfront
Product \@Frontmcp\/Sdk
Version Range Affected
To 1.0.4 (exclusive)
cpe:2.3:a:agentfront:\@frontmcp\/sdk:*:*:*:*:*:node.js:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

\@Frontmcp\/Adapters by Agentfront

Product Information
Vendor Agentfront
Product \@Frontmcp\/Adapters
Version Range Affected
To 1.0.4 (exclusive)
cpe:2.3:a:agentfront:\@frontmcp\/adapters:*:*:*:*:*:node.js:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Mcp-From-Openapi by Frontmcp

Product Information
Vendor Frontmcp
Product Mcp-From-Openapi
Version Range Affected
To 2.3.0 (exclusive)
cpe:2.3:a:frontmcp:mcp-from-openapi:*:*:*:*:*:node.js:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/agentfront/frontmcp/security/advisories/…
https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj
https://github.com/agentfront/frontmcp/releases/tag/v1.0.4
https://github.com/agentfront/frontmcp/releases/tag/v1.0.4
https://github.com/agentfront/frontmcp/security/advisories/…
https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj