Server-side request forgery in mcp-markdownify-server
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | mcp-markdownify-server | before 1.0.0 | 1.0.0 | Patch available | CNA |
| — | mcp-markdownify-server (npm) | up to 0.0.1 | — | No fix listed | GHSA-frq9-3hp2-xvxg |
- mcp-markdownify-server Vendor— Affected before 1.0.0 Fixed in 1.0.0 Patch available CNA
- mcp-markdownify-server (npm) Vendor— Affected up to 0.0.1 Fixed in — No fix listed GHSA-frq9-3hp2-xvxg
Remediation
- Fix · CNA mcp-markdownify-server Fixed in 1.0.0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
mcp-markdownify-server 1.0.0
2 records Highest priority Priority HIGH 2 HIGH
Other records, highest priority first
- TI-2025-04737 Versions of the package mcp-markdownify-server before 1.0.0 are vulnerable to Files or…Priority HIGH 69
Timeline
- 2026-10-02 Threatist record created from CVE-2025-5276
- 2026-10-03 Alias added: GHSA-frq9-3hp2-xvxg
References
Other 4
- https://github.com/zcaceres/markdownify-mcp/commit/0284aa8f34d32c65e20d8cda2d429b7943c9af03
- https://github.com/zcaceres/markdownify-mcp/blob/224cf89f0d58616d2a5522f60f184e8391d1c9e3/src/server.ts%23L20C17-L20C29
- https://github.com/zcaceres/markdownify-mcp
- https://github.com/zcaceres/markdownify-mcp/blob/224cf89f0d58616d2a5522f60f184e8391d1c9e3/src/server.ts#L20C17-L20C29
Sources
- CVE-2025-5276 · CVE Program
- CVE-2025-5276 · NVD
- FIRST EPSS
- GHSA-frq9-3hp2-xvxg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences