🛡️ Sentinel: [HIGH] Fix XSS vulnerability in DescriptionPreview

[bobdivx]

🛡️ Sentinel: [HIGH] Fix XSS vulnerability in DescriptionPreview

🚨 Severity: HIGH
💡 Vulnerability: User input and BBCode-to-HTML converted data from trackers was being passed directly to dangerouslySetInnerHTML in src/components/upload/DescriptionPreview.tsx without sanitization, leading to an XSS vulnerability.
🎯 Impact: An attacker could inject malicious scripts through torrent descriptions, potentially compromising user sessions or executing arbitrary code in the context of the application.
🔧 Fix: Installed isomorphic-dompurify and applied DOMPurify.sanitize() to the HTML before rendering it via dangerouslySetInnerHTML. The isomorphic version was chosen to ensure safe execution across both SSR (Node.js) and CSR (Browser).
✅ Verification: Build succeeds, tests pass, and manual review confirms sanitization is applied. Added a critical learning to .jules/sentinel.md.

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PR created automatically by Jules for task 17173046131014348472 started by @bobdivx

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Project	Deployment	Actions	Updated (UTC)
popcorn-client	Ready	Preview, Comment	Mar 14, 2026 7:22am

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request delivers a critical security update by patching a high-severity XSS vulnerability. It introduces robust HTML sanitization to prevent malicious code from being executed when displaying user-generated content, thereby significantly enhancing the application's security posture and protecting users from potential attacks.

Highlights

• Security Fix: XSS Vulnerability: Addressed a high-severity Cross-Site Scripting (XSS) vulnerability in the DescriptionPreview component where unsanitized user input and BBCode-to-HTML converted data were rendered directly, allowing malicious script injection.
• HTML Sanitization Implementation: Integrated isomorphic-dompurify to sanitize HTML content before it is rendered using dangerouslySetInnerHTML. This ensures that potentially malicious scripts are removed, protecting user sessions and application integrity.
• Isomorphic Solution for SSR/CSR: Selected isomorphic-dompurify to guarantee consistent and secure sanitization across both server-side rendering (SSR) and client-side rendering (CSR) environments, preventing issues with window object dependencies.
• Documentation of Learning: A new entry was added to .jules/sentinel.md to document the vulnerability, the learning derived from its fix, and best practices for preventing similar issues in Astro/Preact applications.

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Changelog

• .astro/content.d.ts
  • Updated the import path for ContentConfig to use a relative path.
• .astro/types.d.ts
  • Added a reference to content.d.ts to ensure proper type declarations.
• .jules/sentinel.md
  • Added a new entry detailing the XSS vulnerability in DescriptionPreview.tsx, the learning from using isomorphic-dompurify for SSR/CSR, and prevention guidelines.
• package-lock.json
  • Added isomorphic-dompurify and @types/dompurify as new dependencies.
  • Updated versions for several existing dependencies, including @asamuzakjp/dom-selector, @exodus/bytes, and undici.
  • Removed dev: true flags from numerous dependency entries, indicating a change in their development status or how they are tracked.
• package.json
  • Added isomorphic-dompurify as a production dependency.
  • Added @types/dompurify as a development dependency.
• public/VERSION.json
  • Incremented the client version from 1.2.97 to 1.2.98.
  • Incremented the client build number from 198 to 199.
• src/components/upload/DescriptionPreview.tsx
  • Imported DOMPurify from isomorphic-dompurify.
  • Modified the sanitizePreviewHtml function to apply DOMPurify.sanitize() to the HTML string after removing residual placeholders, effectively preventing XSS.

Activity

• The pull request was automatically created by Jules for task 17173046131014348472, initiated by @bobdivx.
• Verification steps confirmed that the build succeeds, tests pass, and manual review validated the applied sanitization.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a high-severity XSS vulnerability in the DescriptionPreview component by sanitizing HTML with isomorphic-dompurify before rendering. The approach is sound, and the addition of a security learning document is a great practice. I have one minor suggestion to improve code conciseness.

[gemini-code-assist]

For conciseness, you can chain the replace and sanitize calls. This avoids creating an intermediate variable.

Suggested change

	const cleanedHtml = html.replace(/\{\}/g, '');
	return DOMPurify.sanitize(cleanedHtml);
	return DOMPurify.sanitize(html.replace(/\{\}/g, ''));