this post was submitted on 10 Jul 2023
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JavaScript needs access to the cookies, they are the data storage for a given site.
To protect them, the browser silos them to the individual site that created them, that's why developers haven't been able to easily load cross domain content for years, to mitigate XSS attacks.
The security relies on the premise that the only valid source of script is the originating domain.
The flaw here was allowing clients to add arbitrary script that was displayed to others.
You're dead right that only the way to fix this is to do away with JavaScript access to certain things, but it will require a complete refactor of how cookies work.
I haven't done any web dev in a few years, this might even be a solved problem by now and we are just seeing an old school implementation. ๐คท
Yes, it is called
HttpOnly
and is decided by the server who is sending the cookie to you in HTTP response header. I believe there are also HTTPS-only cookies that when received via HTTPS, cannot be used from HTTP, but I cannot find it right now.Secure
is what you're looking for.