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Vulnerability record · CVE-2026-39885 · published 8 April 2026

CVE-2026-39885: Agentfront \@frontmcp\/adapters server-side request forgery (ssrf) vulnerability

Agentfront · \@Frontmcp\/Adapters

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.

7.5 CVSS 3.1 High EPSS 0.42% · top 65.9% CWE-918 · Server-side request forgery (SSRF)
7.5CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
3References, 2 tagged exploit
24 Jul 2026Last modified by NVD

Description

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.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/agentfront/frontmcp/releases/tag/v1.0.4 Product
https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj ExploitVendor Advisory
https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-39885), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.