As of March 16 revision (adding 4 more CVE's fixed), the article on Security fixes still doesn't show the above changes. (They did revise the article on Feb. 16 to correct the original build numbers typo, but it still says version 16.3, and doesn't have the .7 build update I noted above for macOS Big Sur. I assumed they would eventually correct that or create a new article for v16.3.1, but after a month & several article revisions still not showing the above changes, not sure they ever will.)

"This update provides important security fixes and is recommended for all users."

"(CVE-2023-23529)
Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited."

(Info below added Feb. 14, with a typo (the 7 that I bolded) in both build numbers.)
* After installing this update, the build number for Safari 16.3 is 167614.4.6.11.6 on macOS Big Sur and 177614.4.6.11.6 on macOS Monterey."

(Version 16.3 update builds were 16614.4.6.11.6 for Big Sur & 17614.4.6.11.6 for Monterey.
Article revised again on Feb. 16 to correct the build numbers, but still shows v16.3.
However Feb 16th new Safari version 16.3.1 update has a later build number.)

FYI: Installed "Safari 16.3.1 update" on an M1 Mini running macOS 11.7.3, but Safari still shows version 16.3. Rebooted, booted in Safe Mode - still shows v16.3, although Get Info on Safari app shows it was modified. I don't remember the original Safari 16.3 build number, but after the update it's shown as (16614.4.6.11.6, 16614) in macOS 11.7.3.
(Posts in Safari forum from Monterey users also said Safari 16.3.1 installed still shows v16.3.)
I'm guessing there will be a revision to the security update article to add a note about this with what the updated build number is for each OS.
Feb 14 Update: Apple revised the article to say it's still v16.3, with new build numbers.
Feb 15 Update: Installed macOS 11.7.4, & software update shows another Safari 16.3.1 update.

"This update provides important bug fixes and security updates for your Mac."

You can check feedback in Apple's macOS Ventura discussion forum.
(Curious if this helps M2 mini owners that have Wi-Fi/Ethernet problems.
Some posted macOS 13.2.1 helped, but some others said they still have problems.)

(VPN or 3rd party Security software may cause problems with OS or security updates.
Apple's article on VPN and 3rd party software issues & the usual advice on updates.)

• About the security content of iOS 16.3.1 and iPadOS 16.3.1 lists 3 CVEs fixed, including CVE-2023-23529 that "Apple is aware of a report that this issue may have been actively exploited".
  
  
• About iOS 16.3.1 says:
  "This update provides important bug fixes and security updates for your iPhone including:
  - iCloud settings may be unresponsive or incorrectly display if apps are using iCloud.
  - Siri requests for Find My may not work.
  - Crash Detection optimizations on iPhone 14 and iPhone 14 Pro models."
  (Apple's iPhone discussion forum.)
  
  
• About iPadOS 16.3.1 says:
  "This update provides important bug fixes and security updates for your iPad including:
  - iCloud settings may be unresponsive or incorrectly display if apps are using iCloud.
  - Siri requests for Find My may not work."
  (Apple's iPad discussion forum.)
  

• Info from about tvOS Updates for version 16.3.2:
  "This update includes general performance and stability improvements" (typical note).
  About the security content of tvOS 16.3.2 lists 1 CVE fixed (CVE-2023-23524).
  You can check feedback in Apple TV discussion forum.
  
  
• Info from about watchOS Updates for 9.3.1:
  "This update includes bug fixes and important security updates for your Apple Watch."
  About the security content of watchOS 9.3.1 lists 1 CVE fixed (CVE-2023-23524).
  You can check feedback in Watch discussion forum.

"This update addresses an issue where asking Siri to control smart home accessories may fail, and also includes general performance and stability improvements."

• Firefox 110.0 release notes lists new features and security fixes.
  (Also see Firefox for Enterprise 110 release notes.)
  
  
• Firefox ESR 102.8 has "Various security fixes".
  
  
• iOS Firefox version 110 for iOS/iPadOS 13 or later
  - "Bug fixes and technical improvements".
  
  
• Firefox Focus: Privacy browser version 110.0 for iOS/iPadOS 14 or later
  - "Bug fixes and technical improvements".

• Geekbench 6 released
  - See linked blog for changes and improvements.
  
  
• Micromat Drive Scope 1.2.19 update (S.M.A.R.T. Tool for Macs)
  
  
• Web Push for Web Apps on iOS and iPadOS (Apple WebKit)
  
  
• Apple TestFlight app version 3.2.4 (app store link)
  - This update includes stability improvements and bug fixes..
  (See linked app store page for system requirements.)
  
  
• Microsoft Office for Mac (365/2021/2019) version 16.70 (23021201)
  - See February 14, 2023 release notes for changes.
  - Includes security update for Word (CVE-2023-21716).
  
  
• The User Activation API (Apple WebKit blog)
  
  
• Declarative Shadow DOM (Apple WebKit blog)

• Use Safari extensions on your Mac
  - How to install them, uninstall them, or share them across devices.
  
  
• Find out which macOS your Mac is using
  - Added macOS Big Sur 11.7.4. (Added Ventura 13.2.1 on Feb 13.)
  
  
• How to Back up your Mac with Time Machine
  
  
• Use reference modes with your Apple display
  
  
• What's new in Shortcuts
  
  
• How to turn Private Browsing on or off on your iPad
  
  
• Control personalized ads on the App Store, Apple News, and Stocks

February 6th to 10th, 2023 News Archive
• Safari Technology Preview 163.
• tvOS 16.3.1 Update.
• Chrome 110.0.5481.77 Stable Channel Update for Mac.
• iOS Chrome browser 110.0.5481.83 for iOS/iPadOS 14.0 or later.
• Apple Support/How-To/Troubleshooting Article Updates.
• SVS Subwoofer Control iOS App v1.3.65 Presets Bug .
• LG B6 OLED TVs & UH6330/7650/7700 LCD TVs Firmware Update 05.70.40.
• Yamaha Steinberg USB Driver v3.1.4 for macOS 11.x/12.x/13.x.
• Yamaha Steinberg USB Driver v2.1.4 for macOS 10.15 to 10.13.
• LG Z2 OLED TV Firmware Update 03.30.16.

For links to older news pages, see the Archives.