test-csp-violation-form-action.html

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<html>

      <head>

          <title>CSP Base-URI Violation Test </title>

          <base href="https://evil.com/">

      </head>

      <body>

          <form action="evil.com" >

              <input type="text" value="test" name="test" />

              <button type="submit">Submit Button</button>

          </form>

      </body>

      <script>

        "use strict";

        document.querySelector("form").submit();

      </script>

    </html>