alt Hacker NewsThis is a pretty scary exploit, considering how easily it could be abused.
Imagine just one link in a tweet, support ticket, or email: https://discord.com/_mintlify/static/evil/exploit.svg. If you click it, JavaScript runs on the discord.com origin.
Here's what could happen:
- Your Discord session cookies and token could be stolen, leading to a complete account takeover.
- read/write your developer applications & webhooks, allowing them to add or modify bots, reset secrets, and push malicious updates to millions.
- access any Discord API endpoint as you, meaning they could join or delete servers, DM friends, or even buy Nitro with your saved payment info.
- maybe even harvest OAuth tokens from sites that use "Login with Disord."
Given the potential damage, the $4,000 bounty feels like a slap in the face.
edit: just noticed how HN just turned this into a clickable link - this makes it even scarier!
Replies
The fact that it is just so trivial and obvious that its scary. It didn't even require any real hacking chops, just patience: literally anyone with a cursory knowledge of site design could have stumbled on this if they were looking at it.
Terrifying.
> - Your Discord session cookies and token could be stolen, leading to a complete account takeover.
Discord uses HttpOnly cookies (except for the cookie consent banner).
>the $4,000 bounty feels like a slap in the face.
And serves a reminder crime does pay.
In the black market, it would have been worth a bit more.
Doesn't stealing the cookies/token require a non-HTTP-only session cookie or a token in localstorage? Do you know that Discord puts their secrets in one of those insecure places, or was it just a guess?
I believe if you always keep session cookies in secure, HTTP-only cookies, then you are more resilient to this attack.
I interviewed frontend devs last year and was shocked how few knew about this stuff.