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On the breached site and everywhere else you reused it. Make every password unique.
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MalwareBytes.org breach: questions and answers
When did the MalwareBytes.org data breach happen?
The MalwareBytes.org breach dates to November 2014.
How many records were leaked in the MalwareBytes.org breach?
LeakCheck has indexed 111,747 records from the MalwareBytes.org breach.
What data was exposed in the MalwareBytes.org breach?
The leaked records include email addresses, usernames, passwords and IP addresses.
Were passwords exposed in the MalwareBytes.org breach?
Yes. The indexed MalwareBytes.org records include passwords, in plain text or hashed. If you had an account, change that password and every other password you reused.
How do I check if my data was in the MalwareBytes.org breach?
Enter your email address, username or phone number in the search form on this page. The free check shows whether your data appears in the MalwareBytes.org breach — and in any of the other 1,468 sources LeakCheck indexes.
What should I do if my data was in the MalwareBytes.org breach?
Change the password you used on MalwareBytes.org and everywhere you reused it, turn on two-factor authentication, and watch for phishing that quotes details from the leak. To hear about the next breach first, set up breach monitoring.