Checking existence of firewalled URLs via javascript’s script.onload

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Posted by Georgi Guninski on Apr 21

There is minor information disclosure vulnerability similar
to nmap in browser.

It is possible to check the existence of firewalled URL U via
the following javascript in a browser:

<script src=”U”
onload=”alert(‘Exists’)”
onerror=”alert(‘Does not exist’)”>

This might have privacy implication on potentially
“semi-blind CSRF” (XXX does this makes sense?).

Works for me in…

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