this post was submitted on 10 Jul 2023
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If lenny-ui is already using a JSX based library (InfernoJS), why not use it? I can't believe they construct HTML manually like that without a hint of escaping or stripping. Sure, many markdown renderers tell you to just slap it in __html or dangerouslySetInnerHtml but there are many that just parse the MD and let you render it with JSX!
I also can't believe there's no CSP that stopped this. Sure, it's a pain in the ass to configure with a nonce but this is literally the kind of thing it's made to block!