this post was submitted on 10 Jul 2023
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One thing I don't get. Custom emojis can only be created by an admin, but you're saying an admin's account here got compromised because of that and not the other way around. Does that mean that an evil instance set a custom emoji with the injected JavaScript and propagated it to the federated instances?
From the fix, I believe the custom emojis were not double checked after a user submits a post. The post data was used to display the emojis, and thus allowing injection.
The fix now is to search the emojis in the custom emojis list from the backend rather than the user post.