A massive security incident exposed 12 TB of Valve's internal data after an old, unprotected server was left publicly accessible. The leak spans from 2003 to 2013 and includes source code, development versions, and unreleased content from major titles including Counter-Strike: Global Offensive, a pre-release version of Left 4 Dead, the complete 2009 beta of Portal 2, and materials from Half-Life 2: Episode 3.
While the breach is significant in scope, Valve has not confirmed whether personal user data, passwords, or financial information was compromised. The incident highlights the risks posed by legacy infrastructure left online without proper security controls, even when companies have moved on to newer systems.