Steam security alert: 89 million accounts allegedly compromised in third-party breach. Experts recommend password changes despite Valve's denial.

The leak consisted of old text messages containing one-time authentication codes that had all expired. These were linked to the phone numbers they were sent to, but the phone numbers were not linked to any account details.

Data breach at Steam suggests over 89 million accounts and the 2FA codes of Messages, Delivery status, and Routing have been compromised.