The developers have released WordPress 5.5.2 as a security and maintenance update on October 29, 2020. In this version 14 bugs are fixed, which are described in the release notes. The update fixes a critical vulnerability that allows a remote attacker to take over a page via a denial of service attack (see also). So you should update as soon as possible – here the blogs were updated immediately after release. Addenum: On October 30, 2020 WordPress 5.5.3 has been released as a bug fix update.
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