this post was submitted on 10 Jul 2023
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Pretty much, and it's not even XSS (it's not cross-site), it's just plain basic HTML injection breaking out of Markdown. At least as far as I was able to find.
XSS is a blanket term for vulnerabilities that allows attackers to inject client-side scripts. Looks like someone is already identified and submitted a pull request that contain a fix: https://github.com/LemmyNet/lemmy-ui/pull/1897/files
Aaaargh yeah using typescript doesn't do jack when your API is stringly-typed. This erm wouldn't have happened on the backend.