Apple Releases macOS Big Sur 11.2.3 With WebKit Security Fix
Apple today released macOS Big Sur 11.2.3, the fifth update to the macOS Big Sur operating system that launched in November. macOS Big Sur 11.2.3 comes two weeks after the release of macOS 11.2.2, a bug fix update.

The new macOS Big Sur 11.2.3 update can be downloaded for free on all eligible Macs using the Software Update section of System Preferences.
Apple says that macOS Big Sur 11.2.3 introduces important security updates and should be installed by all users, with an additional support document clarifying that the software addresses WebKit vulnerability that could allow maliciously crafted web content to execute code.
Apple has also released a new version of Safari (14.0.3) for macOS Catalina and macOS Mojave users.
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Top Rated Comments
1 Open Music app ?
2 Play Easy Listening for 1 hour ?
3 Open Software Update
You should see the update now.
http://swcdn.apple.com/content/downloads/12/32/071-14766-A_Q2H6ELXGVG/zx8saim8tei7fezrmvu4vuab80m0e8a5ll/InstallAssistant.pkg
safari 14.0.3 for catalina link
http://swcdn.apple.com/content/downloads/15/11/071-10831-A_F9U2DK6CTY/iiqyne50g2xt78rc08bnt49yykpo4n3cg7/Safari14.0.3CatalinaAuto.pkg
safari 14.0.3 for mojave link
http://swcdn.apple.com/content/downloads/44/11/071-10830-A_HVHGD91GPY/cr9a8oy39eao60prj4iwtho4s7w7l5cmm7/Safari14.0.3MojaveAuto.pkg
Actually the macos 11.2.2 and 11.2.1 full installers are still available too in case you need to downgrade:
11.2.2 link:
http://swcdn.apple.com/content/downloads/37/23/071-08935-A_VI70PU5ZSV/dxl5i8eyczg8zje0wiks3r03r91euyi9sa/InstallAssistant.pkg
11.2.1 link:
http://swcdn.apple.com/content/downloads/00/60/071-05432-A_QOY2QE0UMR/puuz6c0epc7o0ozyovvi6tjxhzpf6uf04s/InstallAssistant.pkg