Fix insufficient origin validation #502
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ClearlyClaire
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This is a port of the fixes released today for Mastodon (see https://mastodon.social/@MastodonEngineering/111839553542311522)
Due to the severity of the issue, we recommend you merge this patch ASAP.
Please be aware that I only performed cursory verification of the patch's correct behavior, so I encourage you to take your time to review it carefully once it is deployed.
Finally, please understand that we do not officially support older versions (see https://github.com/mastodon/mastodon/blob/main/SECURITY.md for officially supported versions) nor forks, and while I exceptionally ported this patch, I am not able to ensure this will happen for any other patch going forward.