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The vulnerability stems from improper input validation when processing user-supplied Markdown. The exploit demonstrates that raw HTML/script tags in Markdown are rendered as executable code during PDF generation. This indicates the Markdown parser (Remarkable) was configured to allow HTML parsing (html: true), enabling XSS. The server-side PhantomJS environment then executes these scripts, allowing local file read. While exact code isn't visible, the advisory and exploit mechanics point directly to the Markdown-to-HTML conversion function with insecure Remarkable configuration as the root cause.
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| markdown-pdf | npm | <= 11.0.0 |
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