Quote:AdGuard, a popular ad blocker for Android, iOS, Windows, and Mac, has reset all user passwords, the company's CTO Andrey Meshkov announced today.

The company took this decision after suffering a brute-force attack during which an unknown attacker tried to log into user accounts by guessing their passwords.

Meshkov said the attacker used emails and passwords that were previously leaked into the public domain after breaches at other companies.

The AdGuard CTO said attackers were successful in their assault and gained access to some AdGuard accounts, used for storing ad blocker settings.

"We don't know what accounts exactly were accessed by the attackers," Meshkov said. "All passwords stored in AdGuard database are encrypted so we cannot check whether any of them is present in the known leaked database. That's why we decided to reset passwords of all users."