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Date: Wed, 19 Apr 2023 15:49:51 +0300
From: Georgi Guninski <>
Subject: [FD] Checking existence of firewalled URLs via javascript's

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"
    onerror="alert('Does not exist')">

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

Works for me in Firefox, Chrome and Chromium 112.

I believe the issue won't be fixed because it will break
stuff in the mess called internet.

For online test:

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