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🛡️ Sentinel: [security improvement] Harden CSP and secure dynamic button types #131

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🛡️ Sentinel: [security improvement] Harden CSP and secure dynamic button types #131

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5 changes: 5 additions & 0 deletions .jules/sentinel.md
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**Vulnerability:** Use of `innerHTML` for dynamic content and missing Content Security Policy (CSP).
**Learning:** Even if the content is currently static, using `innerHTML` is a dangerous pattern that can lead to XSS if the application grows. Prefer `textContent` and explicit DOM node creation.
**Prevention:** Establish a strong CSP and enforce secure DOM manipulation practices through documentation and code reviews.

## 2025-05-15 - CSP Meta Tag Constraints & Dynamic Button Types
**Vulnerability:** Weak default-src in CSP and implicit button types for dynamic elements.
**Learning:** The `frame-ancestors` directive is ignored when delivered via a `<meta>` tag; it must be set via an HTTP header. Additionally, dynamically created buttons should always have an explicit `type="button"` to prevent accidental form submission if the DOM structure changes.
**Prevention:** Use `default-src 'none'` as a baseline and always explicitly set button types. Be aware of meta-tag CSP limitations.
3 changes: 2 additions & 1 deletion index.html
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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; style-src 'self' 'sha256-fgxmLOznNmVf4GAd24jy5Eiv/Rer+7sVLOBqnsVx0nY='; script-src 'self' 'sha256-cPRnZP+O4z5KsN+vdFstQwgKExGtoN98I3Gq+Tm1aSA='; object-src 'none'; base-uri 'self'; upgrade-insecure-requests;">
<meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src 'self' 'sha256-fgxmLOznNmVf4GAd24jy5Eiv/Rer+7sVLOBqnsVx0nY='; script-src 'self' 'sha256-zIaCm2aUZ8bF/BDuRAXJ6hXOL+/WioI9n16eXnrr1rE='; object-src 'none'; base-uri 'self'; form-action 'none'; upgrade-insecure-requests;">
<meta name="referrer" content="no-referrer">
<title>5ive - UX Sample</title>
<style>
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feedback.appendChild(content);

const closeBtn = document.createElement('button');
closeBtn.type = 'button';
closeBtn.className = 'close-btn';
closeBtn.setAttribute('aria-label', 'Close notification');
closeBtn.textContent = '×';
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