CCleaner 5.36 is a significant update for CCleaner as Piriform not only changed its cleaning rules for browsers and other applications, but also has added an emergency updater to push emergency security update if needed.
Seeing Firefox showing ’embarrassing message on startup, blame CCleaner for cleaning Firefox session by default, it was their default cleaning rule to clean Firefox, Opera, Chrome and other browser’s sessions.
CCleaner cleaning Microsoft Windows Defender scan logs makes Windows anti-malware to trigger PC Status is Potentialy unprotected warning in Windows 10.
CCleaner default cleaning rules changed
Seems the company has learned from these and changed their cleaning rules, and good news is CCleaner from version 5.36, no longer wipes recently used files and saved browser sessions without user’s consent.
Here are the items in Windows and Applications tabs, that CCleaner doesn’t clean by default
Windows Explorer: Most Recently Used documents and other MRU files
Windows Defender: Scan history
Microsoft Office: MRUs
Edge, Chrome/Chromium, Firefox, Opera, Safari, Thunderbird: Current session
Restore CCleaner default cleaning rules
If you’ve upgraded from CCleaner 5.35 to 5.36, you need to right click on Windows and Applications tabs and chose ‘Restore Default State’ for CCleaner to follow new cleaning rules.
CCUpdate.exe, the CCleaner Emergency Updater
If you’re using Avast, you could’ve heard about Emergency Updater component used by company in critical situations. Avast, owner of CCleaner, following CCleaner 5.33 security incident has added CCUpdate, the emergency Updater security feature to CCleaner . The updater runs independently from CCleaner main executable.
Emergency update check runs as a scheduled task in Windows, you can observe it with name CCleaner Update in the Task Scheduler library.