Clipboard hijackEMBEDDED

Intercept copy events inside the iframe and overwrite the user's clipboard with different content.

Behavior by sandbox policy

Policy	Expected result
No sandbox	works
`sandbox="allow-scripts"`	works
`sandbox="" (strictest)`	blocked

Embed snippet

This snippet uses the dedicated embed page. Paste it into your own service and check rendering or blocking behavior.

<iframe src="https://xss-playground.com/embed/clipboard-hijack?lang=en" title="XSS Playground - Clipboard hijack" width="600" height="420" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>

Run

Select and copy this line (Cmd/Ctrl+C). The clipboard ends up with something different.

// no logs

Explanation

The copy event can be intercepted inside the iframe's own origin. The user thinks they copied something from the parent page but the clipboard ends up with attacker content.
Real attack value: swap a wallet address for a similar-looking one, or replace a shell command with a destructive variant.
navigator.clipboard.writeText requires a user gesture, focus, and permissions, so automatic calls are usually blocked.
With sandbox="" (empty), JS is blocked entirely, so this attack stops too.