We just released Mastodon v4.7.2, v4.6.8, v4.5.18 and v4.4.25.
In addition to several bugfixes, they disable HEIF processing to avoid a known critical security issues. We encourage server administrators to update as soon as possible.
Full release notes and update instructions are available on the GitHub releases page.
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Releases · mastodon/mastodon
Your self-hosted, globally interconnected microblogging community - Releases · mastodon/mastodon
GitHub (github.com)