Valve refutes reports of a Steam data leak, stating it was not a breach of their systems.
The leaked data consisted of older text messages containing one-time codes and phone numbers, but did not link to Steam account, password, or payment information.
Valve advises users not to change passwords or phone numbers, but recommends setting up the Steam Mobile Authenticator for enhanced security.
Using SMS messages for two-factor authentication is deemed less secure, and an authenticator app is recommended for better protection of user accounts.