Valve addressed reports of a significant Steam data breach involving 89 million user accounts, assuring that Steam's systems were not compromised. The company is investigating the source of the leak, which appears to stem from a third-party service used for SMS-based two-factor authentication. Users do not need to change passwords or phone numbers. The incident highlights the risks associated with external vendors and supply chain vulnerabilities rather than internal system weaknesses.
You may have seen reports of leaks of older text messages that had previously been sent to Steam customers. We have examined the leak sample and have determined this was NOT a breach of Steam systems.
The alleged Steam data breach is not a direct breach of Steam itself, but rather a supply chain compromise...an external service that Steam relies on was targeted.
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