alt Hacker NewsI struggle to understand the issue .. could someone help me out ?
Ok, you got "https://discord.com/_mintlify/_static/hackerone-a00f3c6c/lma..." to send a controlled payload
But regular users will never hit "https://discord.com/_mintlify/_static/hackerone-a00f3c6c/lma...", so they will never execute your script
I fail to understand how this can be exploited, by whom and in what conditions
Replies
It's hosted on the official domain. That means you have at least 2 options: a) chain in with another issue which allows to load that as a trusted resource, or b) scam people by directing them to an "official" post. Also you get discord cookies access.
You have control over what displays on a page with a discord.com domain, you could manipulate the dom to have a login or something else and have it pass the data to your servers. A user would just see a link from discord.com
You could send that link to an unsuspecting user and steal their cookies, make API requests to send messages on their behalf, etc
Apparently one of the other linked posts shows how you can also gain RCE, since the docs are statically pre-rendered and there’s no sandboxing to prevent you from evalling arbitrary JavaScript.
if you click on the link because it has discord.com in the domain the script in the SVG can (maybe) get your session data. Not actually sure if that’s true though, I suppose it depends on how the cookies are scoped
You're pretty much on the money. Reflected XSS requires social engineering to really target anyone without other primitives. Unfortunately this report is not very clear about the tangible impacts or limitations of what they could do with this particular XSS either. Saying that every Mintlify customer was "vulnerable to account takeover with a single malicious link" strikes me as specious to say the least. Still, can't fault kids for getting excited about recognition and a payout.