Apple released Security Update 2019-004 (Sierra) and Security Update 2019-004 (High Sierra) on Monday. Both updates contain security patches also found in macOS Mojave 10.14.6.
[Update: Links to Sierra download updated.]
Patch Notes for Security Update 2019-004 (Sierra)
Security Update 2019-004 is recommended for all users and improves the security of macOS. For more information on the security content of this update see: https://support.apple.com/kb/HT201222
Security Update 2019-004 (Sierra) is a 927.6MB download. You can also install it through Software Update on your Mac running Sierra.
Patch Notes for Security Update 2019-004 (High Sierra)
Security Update 2019-004 is recommended for all users and improves the security of macOS. For more information on the security content of this update see: https://support.apple.com/kb/HT201222
Security Update 2019-004 (High Sierra) is a 1.9GB download. You can also install it through Software Update on your Mac running Sierra.
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Security Update for Sierra hereinabove is for High Sierra.
Thanks! Both links to the Sierra download have been corrected. ☺️