We just released Mastodon 4.3.4, 4.2.17 and 4.1.23. They contain bug fixes as well as security fixes (medium severity)
We recommend every instance administrator to update as soon as possible.
If you are using our nightly releases, a container image with the fix has been published with the `nightly.2025-01-27-security` tag.
Full release notes and update instructions are available on our GitHub release page: 
#mastoadmin
GitHub
Releases ยท mastodon/mastodon
Your self-hosted, globally interconnected microblogging community - mastodon/mastodon