CVE-2025-5276 | THREATINT

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.

Reserved 2025-05-27 | Published 2025-05-29 | Updated 2025-05-29 | Assigner snyk

HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:PHIGH: 7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:P

Problem types

Server-Side Request Forgery (SSRF)

Credits

Raul Onitza-Klugman (Snyk Security Research)

References

security.snyk.io/vuln/SNYK-JS-MCPMARKDOWNIFYSERVER-10249387

github.com/...ommit/0284aa8f34d32c65e20d8cda2d429b7943c9af03

github.com/...f60f184e8391d1c9e3/src/server.ts#L20C17-L20C29

cve.org (CVE-2025-5276)

nvd.nist.gov (CVE-2025-5276)

Download JSON