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

.jules/sentinel.md

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+# Sentinel Journal
+
+## 2024-07-03 - [Missing Content Security Policy in HTML UI]
+
+**Vulnerability:** The HTML application (`studio/index.html`) lacked a Content
+Security Policy (CSP), leaving it potentially vulnerable to Cross-Site
+Scripting (XSS) attacks. Without a CSP, the browser doesn't restrict the
+sources from which resources like scripts, styles, and images can be loaded,
+potentially allowing malicious scripts to execute.
+
+**Learning:** Static HTML pages that don't seem to take user input might still
+benefit from a CSP to establish defense-in-depth, especially when they might be
+deployed as parts of a larger platform or where unexpected data processing
+might occur. The application only needs local scripts, CDNJS for font awesome,
+and fonts.googleapis.com, making a restrictive CSP easy to define and
+implement.
+
+**Prevention:** Implement a Content Security Policy by default for all HTML web
+interfaces, specifying exactly which external domains are authorized to serve
+scripts, styles, fonts, and images. Always restrict `default-src` to `'self'`
+where possible.

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studio/index.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>RTX⚡ Tech-Debate Viral Poster Studio</title>
+    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdnjs.cloudflare.com; style-src 'self' https://fonts.googleapis.com https://cdnjs.cloudflare.com; img-src 'self' data: blob:;">
     <!-- Premium Google Fonts -->
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>