Apple has released updates to three of their four operating systems today. While watchOS is probably of limited interest to IT professionals, the changes to macOS and iOS deal with bug fixes and "other improvements". For the users and administrators responsible for Macs, there's a fix that "Resolves an issue that prevents making certain SMB connections from the Finder".
Detailed information on the macOS 10.12.6 update can be found here.
As always, I recommend installing security-related patches as soon as possible. One of the most frequently used attack methods employed by malware developers and distributors is to target systems that are unpatched. While Apple and other software developers are doing the right thing in telling us what they have fixed, the release notes also act as a list of potential vulnerabilities that can be exploited.