Urgent post from reddit /u/Executioner1337.

Users are reporting breaches, and thousands of dollars have been stolen with the client, all over /r/teamviewer and at their support Twitter account. TV is blaming users with reusing passwords, yet users with 2FA and unique very long generated passwords were hacked.

Some also suggest that their DNS servers were hijacked and the clients believed the fake server, being the method of the attack.

One of the main problems are that they are not taking responsibility: (quoted from /u/rich-uk)

This may or may not be that TeamViewer is actually hacked, the more likely scenario is that they are re-using password combonations from other sites, however on ANY AND ALL screen-sharing websites, you should NEVER reuse username and password combos from other sites, not matter how secure you think they may be.

EDIT from Reddit /u/savage24x:

That's how I got hacked. 5/25/2016 and 5/28/2016, they logged into one of my computers at 3:24AM both days and used my PayPal, Microsoft account, eBay account, to buy tons of codes for different online stores. I just checked my browser history on that computer and sure enough, all those sites were visited. My bank took care of everything, so did PayPal and Microsoft. It was fucking teamviewer. I enabled TFA for the time being and turned off all computers connected to teamviewer.

EDIT from TeamViewer:

Some online media outlets falsely linked the incident with past claims by users that their accounts have been hacked and theories about would-be security breaches at TeamViewer. We have no evidence that these issues are related.

The truth of the matter is:

Careless use of account credentials remains to be a key problem for all internet services. This particularly includes the use of the same password across multiple user accounts with various internet services.

In addition, users might unintentionally download and install malware programs. Yet once a system is infected, perpetrators can virtually do anything with that particular system – depending on how intricate the malware is, it can capture the entire system, seize or manipulate information, and so forth.

TeamViewer strongly recommends:

TeamViewer recommends that users who have been the victim of criminal activities get in touch with their local police departments, in order to report their cases. This is particularly important because TeamViewer is subject to very strict data protection and privacy regulations, and can release sensitive data only to authorized individuals and authorities.