CVE-2025-5276 Details
Description
Versions of the package mcp-markdownify-server before 1.0.0 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.
A Server-Side Request Forgery (SSRF) vulnerability exists in all versions of the mcp-markdownify-server package. The issue arises in the Markdownify.get() function, where an attacker can create a prompt that, when processed by the MCP host, triggers the webpage-to-markdown, bing-search-to-markdown, and youtube-to-markdown tools. This can result in requests being sent to URLs controlled by the attacker, potentially leaking sensitive information from the responses.
Users can update to the latest version of the mcp-markdownify-server package, which includes a URL validation feature that helps mitigate this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 29, 2025CISA-ADP
Assessed May 29, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://security.snyk.io/vuln/SNYK-JS-MCPMARKDOWNIFYSERVER-10249387 | CISA-ADP | AdvisoryBroken Link |
| https://github.com/zcaceres/markdownify-mcp/blob/224cf89f0d58616d2a5522f60f184e8391d1c9e3/src/server.ts%23L20C17-L20C29 | [email protected] | Source CodeVendor |
| https://github.com/zcaceres/markdownify-mcp/commit/0284aa8f34d32c65e20d8cda2d429b7943c9af03 | [email protected] | Source CodeVendor |
| https://security.snyk.io/vuln/SNYK-JS-MCPMARKDOWNIFYSERVER-10249387 | [email protected] | AdvisoryBroken Link |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | CISA-ADP |
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| zcaceres mcp-markdownify-server | All versions |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 2, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| May 29, 2025 | CVE Modified | CISA-ADP |
| May 29, 2025 | New CVE Received | [email protected] |