GitHub Advisoryadvisory · npm

GHSA-frq9-3hp2-xvxg Markdownify MCP Server allows Server-Side Request Forgery (SSRF) via the Markdownify.get() function

MEDIUM Published 2025-05-29 Modified 2025-05-29 Official page ↗
Aliases
CVE-2025-5276
Ecosystem
npm
Packages
mcp-markdownify-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weaknesses
CWE-918
Reviewed
2025-05-29

Affected packages

• npm mcp-markdownify-server: <= 0.0.1 (no fix yet)

Description

All versions of the package mcp-markdownify-server are vulnerable to Server-Side Request Forgery (SSRF) via the Markdownify.get() function. An attacker can craft a prompt that, once accessed by the MCP host, can invoke the webpage-to-markdown, bing-search-to-markdown, and youtube-to-markdown tools to issue requests and read the responses to attacker-controlled URLs, potentially leaking sensitive information.

Related

Alias · CVE (1)

  • CVE-2025-5276 Versions of the package mcp-markdownify-server before 1.0.0 are vulnerable to Server-Side Request Forgery (SSRF) via the Markdownify.get()… vulnerability

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References