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Hacker advertises alleged database of 89 million Steam 2FA codes, source of leak unknown

  • On May 14, 2025, a hacker named Machine1337 posted on a dark web forum offering a database of over 89 million Steam user records for $5,000.
  • The breach appears to stem from a supply chain attack on a third-party vendor, with conflicting claims about involvement of Twilio, Steam's 2FA SMS provider.
  • The leaked data reportedly includes historic SMS one-time passcodes and phone numbers, raising concerns about phishing and session hijacking risks for approximately 70% of Steam's users.
  • Twilio and Valve have denied being breached, with Twilio stating there is no evidence their systems were compromised despite reviewing samples of the leaked data.
  • Users are advised to activate Steam's mobile-based two-factor authentication and remain vigilant by regularly reviewing their account activity, while Valve has not yet issued an official statement.
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ActuGaming.net broke the news in on Wednesday, May 14, 2025.
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