Created
November 10, 2022 13:03
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| <title>Login Frame</title> | |
| <script type="text/JavaScript"> | |
| const allowed = [ | |
| window.location.host, "localhost" | |
| ]; | |
| window.addEventListener('message', (event) => { | |
| const anchor = document.createElement('a'); | |
| anchor.href = event.data.domain; | |
| const isAllowed = allowed.filter(d => { | |
| return d === anchor.host | |
| }).length > 0; | |
| if (isAllowed) { | |
| const data = { | |
| token: localStorage.getItem('accessToken') | |
| }; | |
| window.parent.postMessage( | |
| data, event.data.domain | |
| ); | |
| } | |
| }); | |
| </script> |
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an attacker can append his domain address to allowed list.
Then send a window.postMessage() from his domain address