Escape reflected asdf parameter in upgrade.php to prevent XSS #89
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Unvalidated input from the
asdfparameter in upgrade.php is directly echoed into the HTTP response on lines 17-18, resulting in a reflected cross-site scripting (XSS) vulnerability. An attacker can craft a malicious URL, such as?asdf=<script>...</script>, to inject arbitrary JavaScript into a victim's browser. This can lead to session hijacking, cross-site request forgery (CSRF), or other client-side attacks.