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The Invisible Checkout: How Clickjacking Diverted $800,000 in Payments
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HIGH THREATCWE-1021 / UI Redressing6 min read

The Invisible Checkout: How Clickjacking Diverted $800,000 in Payments

How an attacker embedded an e-commerce checkout page inside a transparent iframe on a malicious movie-streaming site, tricking users into clicking "Play Video" while actually authorizing a $500 gift card purchase.

Documented Real-World Damage: $800,000 Stolen via Invisible Payment Iframe
Interactive Exploit Sandbox

Simulate Attack Payload vs. Defense

Injected Payload (Attacker Input):
<iframe src="https://vulnerable-store.com/checkout/one-click-pay" style="opacity:0; position:absolute; z-index:2;"></iframe>
Server Execution Result (Unpatched Application):EXPLOIT SUCCEEDED
Framing Allowed!
Page embedded inside transparent iframe.
User click hijacked to authorize $500 payment.

Source Code Dissection & Fix

<!-- Vulnerable Checkout Server Response Headers: -->
<!-- FATAL FLAW: Missing X-Frame-Options and Content-Security-Policy! -->
HTTP/1.1 200 OK
Content-Type: text/html
<!-- (Zero X-Frame-Options header present) -->

Clickjacking Explained

Clickjacking embeds a target page invisibly (`opacity: 0`) directly over an attractive button (e.g. "Play Video"). When the victim clicks, their click is registered by the underlying checkout page, authorizing a transaction. Adding `X-Frame-Options: SAMEORIGIN` and CSP `frame-ancestors 'self'` instructs browsers to refuse embedding inside third-party frames.

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The Invisible Checkout: How Clickjacking Diver… · DataArena