"Safari 14.1*
(article includes 2 webkit fixes.)
* Safari 14.1 includes the security content of Safari 14.1 (released April 26, 2021). After installing this update, the build number for Safari 14.1 is 15611.1.21.161.7 on macOS Catalina and 14611.1.21.161.7 on macOS Mojave."

"macOS Big Sur 11.3.1 provides important security updates & is recommended for all users."

Notes from M1 mac mini updated to macOS 11.3.1:
(update was from 11.2.3, never updated to 11.3.0.)
- The (6.60GB) macOS 11.3.1 update installed on first try.
At the "Setup iCloud" screen after update, keyboard entry didn't work.
(Alum. Apple USB extended keyboard with USB Apple mouse plugged into keyboard.)
Used mouse to select the "later" option, and keyboard worked after desktop loaded.

- Like most, after update Desktop has "Relocated Items" folder w/group.system.default file.
(this Mini never had any user modified system files or any 3rd party software installed.)

- M1 mini firmware now 6723.101.4. (Was 6723.81.1 from macOS 11.2 update.)

- CVM Server crashes from DVD disc playback seem fixed.
(Some others said 11.3.1 fixed CVM server crashes from other actions.)

- This M1 mini always shows duplicates (same date/time) of Diagnostic logs in Console,
but after the 11.3.1 update, all previous Diagnostics logs are now listed 3 times.
(New Diagnostic listings are duplicates, as seen since day 1 on this M1/Big Sur.)

You can check for feedback in Apple's Big Sur forum.
(And for M1 Mac owners, also check the Mac Mini, MacBook Pro, & MacBook Air forums.)
 

• iOS 14.5.1 release notes
• iPadOS 14.5.1 release notes
• About the security content of iOS 14.5.1 and iPadOS 14.5.1 (2 webkit fixes)
  
  
• iOS 12.5.3 release notes
  - "This update provides important security updates and is recommended for all users".
• About the security content of iOS 12.5.3 (4 webkit/storage fixes)
  
  
• watchOS 7.4.1 release notes
  - "This update provides important security updates and is recommended for all users."
• About the security content of watchOS 7.4.1 (1 webkit fix)

• Fixed an application crash when updating to the latest drive database.
• Fixed a reported application crash for macOS 10.9 "Mavericks" users.
• Updated Sparkle update framework to version 1.26.0.
• Other minor fixes and enhancements.

• Apple awards an additional $410 million from its Advanced Manufacturing Fund to II-VI (pr)
  
  
• New WebKit Features in Safari 14.1 (webkit.org)

• If your Mac doesn't turn on
  
  
• If you get a personalization error when reinstalling macOS on a M1 chip Mac
  
  
• If your Mac starts up to a question mark
  
  
• Find out which macOS your Mac is using
  
  
• Connect to Wi-Fi on your iPhone, iPad, or iPod touch

• Firefox 88.0.1 release notes lists bug fixes and "Various stability and security fixes".
  
  
• Firefox ESR 78.10.1 includes a security fix and "Resolved an issue caused by a recent Widevine plugin update which prevented some purchased video content from playing correctly (bug 1705138)".
  
  
• USA 2016 LG C6 and E6 OLED TVs firmware update 05.60.05
  - post includes info, download pages and tips for turning off Ad tracking.
  FYI: Download pages originally dated May 3rd, now dated May 27th.
  (Same changes notes and unzipped file is same date & time as before.)