Matan · Security · Content

Inline JavaScript

onclick= handlers and javascript: URLs block a strict CSP and enlarge the XSS surface.

Pass condition in our engine: No inline event handlers or javascript: URIs.

1. Problem description

We count inline event handlers and javascript: hrefs. They are not automatically exploitable, but they force 'unsafe-inline' in CSP. Moving logic to external modules is the fix.

2. Most common causes

  • Legacy HTML attributes.
  • mailto-style javascript:void(0) links.

3. How to fix it

  1. Use addEventListener in an external file.
  2. Replace javascript: links with <button> or real hrefs.
  3. Then tighten CSP.

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