Piriform News

CCleaner v5.37

The Piriform team would like to announce the latest release of CCleaner for Windows.

This minor update addresses Firefox and Edge issues reported by our community. If you have suggestions for what you'd like to see next, please drop by our forums and let us know in our suggestions area.

Browser Cleaning

  • Edge: Session clean no longer removes set-aside tabs
  • Firefox: Fixed an issue where some favicons were still being cleaned 

Download now! 
You can download CCleaner Free here.

Fancy a few more features? Download the CCleaner Professional trial version here

If you are already a CCleaner Professional user your installation will update automatically.

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CCleaner v5.36

The Piriform team would like to announce the latest release of CCleaner for Windows.

CCleaner version 5.36 introduces a new security feature, fixed Firefox cleaning and some quality-of-life improvements around our default cleaning preferences.

Browser Cleaning

  • Firefox: updated Session cleaning rule to support changes in Firefox 56.0
  • Chrome (& Chromium): updated Internet History cleaning rule to clean user activity data
  • Opera: updated Internet History cleaning rule to clean user activity data

Default Cleaning Rules

We are changing our default cleaning rules so that your recently used files and saved browser sessions aren't wiped without your explicit consent. These changes will take effect automatically for fresh installations of CCleaner, but we won't overwrite any of your existing preferences. To use the new default settings, go to the 'Cleaner' menu, right click on the 'Windows' and 'Applications' tabs and select 'Restore default state'.

  • Windows Explorer: Most Recently Used documents and other MRU files no longer cleaned by default
  • Windows Defender: Scan history no longer cleaned by default
  • Microsoft Office: MRUs no longer cleaned by default
  • Edge, Chrome/Chromium, Firefox, Opera, Safari, Thunderbird: Current session data no longer cleaned by default

Emergency Updater

Following the security incident in September we have taken steps to improve our security across the board. Within CCleaner, this means the addition of an 'Emergency Updater' security feature that allows us to force a software update in a worse-case scenario. We have ring-fenced the updater in its own executable to allow it to operate independently from the main executable. The update check runs as a scheduled task in Windows.

Emergency Updater checks regularly to see if an emergency security update is available. If one is, it applies the update immediately. Checks only transmit 1-2 KB of data and generally an emergency update will consist of a differential patch roughly 500 KB in size.

  • Added new executable: "CCUpdate.exe"
  • Added new Windows Scheduled Task: "CCleaner Update"

 

Download now! 
You can download CCleaner Free here.

Fancy a few more features? Download the CCleaner Professional trial version here

If you are already a CCleaner Professional user your installation will update automatically.

Stay up to date!
Sign up to receive the latest news, product updates and offers by email.

Connect with us: 
CCleaner on Facebook 
Piriform on Twitter 
Piriform on Google+

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CCleaner v5.35

The Piriform team would like to announce the latest release of CCleaner for Windows.

CCleaner version 5.35 has been released with a new digital signature to update our systems after the September 18th security notification

We encourage all users to update to this new version. 

Download now! 
You can download CCleaner Free here.

Fancy a few more features? Download the CCleaner Professional trial version here

If you are already a CCleaner Professional user your installation will update automatically.

Stay up to date!
Sign up to receive the latest news, product updates and offers by email.

Connect with us: 
CCleaner on Facebook 
Piriform on Twitter 
Piriform on Google+

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Security Notification for CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 for 32-bit Windows users

We recently determined that older versions of our Piriform CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 had been compromised. We estimate that 2.27 million people used the affected software. We resolved this quickly and believe no harm was done to any of our users. This compromise only affected customers with the 32-bit version of the v5.33.6162 of CCleaner and the v1.07.3191 of CCleaner Cloud. No other Piriform or CCleaner products were affected. We encourage all users of the 32-bit version of CCleaner v5.33.6162 to download v5.34 here: download. We apologize and are taking extra measures to ensure this does not happen again.

Issue Summary: Our new parent company, the security company Avast, determined on the 12th of September that the 32-bit version of our CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 products, which may have been used by up to 3% of our users, had been compromised in a sophisticated manner. Piriform CCleaner v5.33.6162 was released on the 15th of August, and a regularly scheduled update to CCleaner, without compromised code, was released on the 12th of September. CCleaner Cloud v1.07.3191 was released on the 24th of August, and updated with a version without compromised code on September 15. The compromise could cause the transmission of non-sensitive data (computer name, IP address, list of installed software, list of active software, list of network adapters) to a 3rd party computer server in the USA. We have no indications that any other data has been sent to the server. Working with US law enforcement, we caused this server to be shut down on the 15th of September before any known harm was done. It would have been an impediment to the law enforcement agency’s investigation to have gone public with this before the server was disabled and we completed our initial assessment. Between the 12th and the 15th, we took immediate action to make sure that our Piriform CCleaner v5.33.6162 and CCleaner Cloud v1.07.3191 users were safe - we worked with download sites to remove CCleaner v5.33.6162, we pushed out a notification to update CCleaner users from v5.33.6162 to v5.34, we automatically updated those where it was possible to do so, and we automatically updated CCleaner Cloud users from v1.07.3191 to 1.07.3214.

We are continuing to investigate how this compromise happened, who did it, and why. We are working with US law enforcement in their investigation. A more technical description of the issue is on our Piriform blog at: www.piriform.com/news/blog. Again, we sincerely apologize for this and are committed to making sure nothing similar happens again. We encourage any user of the 32-bit version of CCleaner v5.33.6162 to download the latest version of Piriform CCleaner found here: www.piriform.com/ccleaner/download/standard.

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CCleaner v5.34

The Piriform team are happy to announce the latest release of CCleaner for Windows.

CCleaner v5.34 brings improved Firefox cleaning and stability improvements across the app. A list of changes can be found in the change log below.

Change log:

Browser Cleaning

  • Firefox: Internet History cleaning rule no longer removes Favicon content

General

  • Minor GUI improvements
  • Minor bug fixes

Download now! 
You can download our free version here

Fancy a few more features? Trial the CCleaner Professional version here

If you are already a CCleaner Professional user your installation will update automatically.

Stay up to date!
Sign up to receive the latest news, product updates and offers by email.

Connect with us: 
CCleaner on Facebook 
Piriform on Twitter 
Piriform on Google+

Read more


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