Joomla! 4.2.8 is now available. This is a security release for the 4.x series of Joomla! which addresses a critical security vulnerability in the web services API. It is strongly recommend that you update your sites immediately and read the article linked to below.
For more info, please read: joomla.org/announcements/release-news/5878-joomla-4-2-8-security-release.html