Valve has confirmed that a cache of old Steam two-factor authentication codes and phone numbers, recently circulated by a hacker known as 'Machine1337', is indeed real, but insists it did not suffer a data breach.

Instead of pointing to its own systems, Valve explained that the leak involves outdated SMS messages, which are typically sent unencrypted and routed through multiple providers. These codes, once valid for only 15 minutes, were not linked to specific Steam accounts, passwords, or payment information.

The leaked data sparked early speculation that third-party messaging provider Twilio was the source of the breach, especially after their name appeared in the dataset. However, both Valve and Twilio denied any direct involvement, with Valve stating it does not even use Twilio's services.

The true origin of the breach remains uncertain, and Valve acknowledged that tracing it may be difficult, as SMS messages often pass through several intermediaries before reaching users.

While the leaked information may not immediately endanger Steam accounts, Valve advised users to remain cautious. Phone numbers, when combined with other data, could still be used for phishing attacks.

Instead of relying on SMS for security, users are encouraged to activate the Steam Mobile Authenticator, which offers a more secure alternative for account verification.

Despite the uncertainty surrounding the source of the breach, Valve reassured users there's no need to change passwords or phone numbers. Still, it urged vigilance, recommending that users routinely review their security settings and remain wary of any unsolicited account notifications.

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