Why have I been updated to v5.63?

As a global software company, we rigorously monitor and test our systems, and cooperate with local, regional, and international agencies to actively track and verify malicious behavior. Through this monitoring, it came to our attention recently that cybercriminals may have been planning to target CCleaner.

At CCleaner, we have a zero-tolerance policy against cybercrime. Although we have found no indications that any users were affected, our users’ security is of utmost importance to us so we took immediate action to develop the latest version of CCleaner as a precautionary measure and update users on versions v5.57 through to v5.62 to this new version. We also proactively revoked the prior product certificate and issued a new one. The signing keys, which let users verify valid software, were also revoked and re-issued. 

Having taken all these precautions, we are confident to say that our CCleaner users are protected and unaffected. If you were an updated user, you will not notice any change to your product settings and can continue to use CCleaner as normal.

You can read more in our blog or find more details of the investigation on the Avast blog.

We always recommend that users use the latest version of CCleaner, and if you are not on the latest version and would like to update, please visit https://www.ccleaner.com/ccleaner/download/standard