A recent security alert has been issued regarding the theft of approximately 1 billion passwords due to malware attacks. Users are urged to change their passwords immediately, especially if they are among the most compromised passwords identified in various reports. The alert highlights that around 24% of all users, including those on Android and iPhone devices, are at risk. Security experts emphasize the urgency of this situation, as hackers can crack certain commonly used passwords in under a second. A list of the worst passwords has been circulated, advising users to avoid these to enhance their security.