Description
A Server-Side Request Forgery (SSRF) vulnerability was discovered in the webpage-to-markdown conversion feature of markdownify-mcp v0.0.2 and before. This vulnerability allows an attacker to bypass private IP restrictions through hostname-based bypass and HTTP redirect chains, enabling access to internal network services.
Affected products
zcaceres: markdownify mcp server
References3
- github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/C… ExploitThird Party Advisory
- thorn-pheasant-6d8.notion.site/markdownify-mcp-Report-2a03daf7b… ExploitThird Party Advisory
- github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/C… ExploitThird Party Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 47 · as of 11 November 2026
- CWE
- CWE-918
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.