Is this vulnerability remotely exploitable over the network?

Yes, if an attacker can provide or modify the OpenAPI specification consumed by the server, they can exploit the vulnerability remotely by embedding malicious $ref values that cause SSRF or local file access during dereferencing.

What level of access does an attacker need to exploit this issue?

The attacker must be able to influence the OpenAPI document processed by mcp-from-openapi—through an upload endpoint, configuration integration, or any mechanism that accepts external specs. No direct filesystem or network access to the server is required beyond that entry point.

What is the safest general fix pattern?

The most robust fix is to harden the dereferencing process: restrict or disable network and file access during schema resolution for untrusted specs, use custom resolvers with strict allowlists, and isolate the processing environment so that even if dereferencing occurs, it cannot reach sensitive internal services or files.

Severity:

HIGH RISK

(7.5)

Server-Side Request Forgery (CWE-918) in FrontMCP mcp-from-openapi Dereferencing

CVE-2026-39885

Published:

Apr 8, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Remote Code Execution by authenticated users via malicious file upload

May 10, 2026

CWE-94

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery and Local File Disclosure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery and Local File Disclosure

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Server-Side Request Forgery (CWE-918) in FrontMCP mcp-from-openapi Dereferencing

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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