Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2026-39885— FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications

CVSS 7.5 · High EPSS 0.04% · P14
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-39885

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
frontmcp 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
frontmcp是AgentFront开源的一个基于TypeScript的MCP服务器开发框架。 FrontMCP 2.3.0之前版本存在代码问题漏洞，该漏洞源于未限制URL引用解析，可能导致服务端请求伪造和本地文件读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
agentfrontfrontmcp < 1.0.4 -
@frontmcpadapters < 1.0.4 -
@frontmcpsdk < 1.0.4 -
frontmcpmcp-from-openapi < 2.3.0 -

II. Public POCs for CVE-2026-39885

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8383 chars
Paid plan includes:
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-39885

请登录查看更多情报信息。

IV. Related Vulnerabilities

Same vendor: agentfront
Same weakness: CWE-918

V. Comments for CVE-2026-39885

No comments yet

Leave a comment