🛡️ Sentinel: [MEDIUM] Add Content Security Policy to HTML UI

[PsProsen-Dev]

🚨 Severity: MEDIUM
💡 Vulnerability: The HTML UI (studio/index.html) lacked a Content Security Policy (CSP), making it potentially vulnerable to XSS and unauthorized resource loading.
🎯 Impact: Without a CSP, the browser might load resources from unauthorized domains, increasing the risk of executing malicious scripts or styles if another vulnerability exists.
🔧 Fix: Added a <meta http-equiv="Content-Security-Policy" ...> tag limiting resources to 'self' and specific trusted domains like Google Fonts and CDNJS.
✅ Verification: grep -rn "Content-Security-Policy" studio/index.html shows the tag is present. The node init-ultron.js script still runs successfully.

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PR created automatically by Jules for task 2040303045550843554 started by @PsProsen-Dev

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[gemini-code-assist]

Code Review

This pull request introduces a Content Security Policy (CSP) to the HTML user interface in studio/index.html and documents the vulnerability fix in .jules/sentinel.md. The reviewer suggests further hardening the CSP by explicitly adding object-src 'none' and base-uri 'self' to prevent potential bypasses.

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[gemini-code-assist]

To further harden the Content Security Policy (CSP) and align with security best practices, it is highly recommended to explicitly restrict object-src and base-uri:

1. object-src 'none': Prevents loading plugins (like Flash or Java) via <object>, <embed>, or <applet> tags, which is a common vector for CSP bypasses.
2. base-uri 'self': Restricts the URLs that can be used in a document's <base> element, preventing attackers from injecting a <base> tag to hijack relative URLs (such as scripts or styles) and load them from a malicious domain.

Suggested change

	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://cdnjs.cloudflare.com; img-src 'self' data: blob:;">
	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://cdnjs.cloudflare.com; img-src 'self' data: blob:; object-src 'none'; base-uri 'self';">

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud