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fix: sanitize blog post HTML to prevent stored XSS #16

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fix: sanitize blog post HTML to prevent stored XSS #16

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9 changes: 8 additions & 1 deletion apps/web/app/blog/[slug]/page.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ import type { Metadata } from 'next';
import { notFound } from 'next/navigation';
import Image from 'next/image';
import Link from 'next/link';
import sanitizeHtml from 'sanitize-html';
import { getDb } from '@/lib/db';

interface Post {
Expand Down Expand Up @@ -93,7 +94,13 @@ export default async function BlogPostPage({ params }: { params: Promise<{ slug:

<div
className="prose prose-gray max-w-none text-gray-700 leading-relaxed [&_h2]:text-xl [&_h2]:font-bold [&_h2]:text-gray-900 [&_h2]:mt-8 [&_h2]:mb-3 [&_h3]:text-base [&_h3]:font-bold [&_h3]:text-gray-800 [&_h3]:mt-6 [&_h3]:mb-2 [&_p]:mb-4 [&_ul]:list-disc [&_ul]:pl-5 [&_ul]:mb-4 [&_ol]:list-decimal [&_ol]:pl-5 [&_ol]:mb-4 [&_li]:mb-1 [&_a]:text-orange-500 [&_a]:underline [&_code]:bg-gray-100 [&_code]:px-1.5 [&_code]:py-0.5 [&_code]:rounded [&_code]:text-sm [&_pre]:bg-gray-900 [&_pre]:text-gray-100 [&_pre]:p-4 [&_pre]:rounded-xl [&_pre]:overflow-x-auto [&_blockquote]:border-l-4 [&_blockquote]:border-orange-300 [&_blockquote]:pl-4 [&_blockquote]:italic [&_blockquote]:text-gray-500"
dangerouslySetInnerHTML={{ __html: post.content }}
dangerouslySetInnerHTML={{ __html: sanitizeHtml(post.content, {
allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img', 'h1', 'h2', 'h3']),
allowedAttributes: {
...sanitizeHtml.defaults.allowedAttributes,
img: ['src', 'alt', 'width', 'height', 'loading'],
},
}) }}
/>
</article>

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1 change: 1 addition & 0 deletions apps/web/package.json
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Expand Up @@ -20,6 +20,7 @@
"posthog-js": "^1.381.0",
"react": "19.2.4",
"react-dom": "19.2.4",
"sanitize-html": "^2.14.0",
"serwist": "^9.5.0"
},
"devDependencies": {
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