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Security: DOM-based XSS via unsanitized innerHTML with remote Markdown #627

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Security: DOM-based XSS via unsanitized innerHTML with remote Markdown #627

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5 changes: 4 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,9 @@
<!-- JavaScript Library to Convert Markdown into HTML -->
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>

<!-- DOMPurify to sanitize HTML output -->
<script src="https://cdn.jsdelivr.net/npm/dompurify/dist/purify.min.js"></script>

<!-- Marked plugin to add heading ID's -->
<script src="https://cdn.jsdelivr.net/npm/marked-gfm-heading-id/lib/index.umd.js"></script>

Expand All @@ -53,7 +56,7 @@
fetch( 'https://raw.githubusercontent.com/offa/android-foss/master/README.md' )
.then( response => response.text() )
.then( data => {
document.querySelector( 'main' ).innerHTML = marked.parse( data );
document.querySelector( 'main' ).innerHTML = DOMPurify.sanitize( marked.parse( data ) );
})
.catch( error => console.error( 'Error:', error ) );

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