Today, Apple released the following updates.
macOS Catalina 10.15.6 Update Security Update for Mojave 10.14 - 2020-004 Security Update for High Sierra 10.13 - 2020-004 Patch & Security information, Download Links, Version info + size for BridgeOS, Combo, Delta, Full Installer app included in the links below!
2020-004 update link coming soon.
https://mrmacintosh.com/whats-new-in-the-macos-catalina-10-15-6-update-19g73/