This page ships a sensitive one-click action and sends no X-Frame-Options or Content-Security-Policy: frame-ancestors header, so it can be framed and overlaid. A real PoC wraps this in a transparent iframe:
<iframe src="http://TARGET/clickjack" style="opacity:.0001;position:absolute;width:600px;height:400px"></iframe>
Fix: send frame-ancestors 'none'. Confirm the missing header with curl -I.
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