This cybersecurity brief for December 1, 2025, covers several critical incidents. The most prominent is a massive data breach at South Korean e-commerce giant Coupang, affecting 33.7 million users due to an authentication vulnerability. Concurrently, Google released an urgent Android update patching 107 flaws, including two zero-days under active exploitation. Other major events include the release of a proof-of-concept for a critical zero-click Outlook RCE, ongoing supply chain attacks from the Shai-Hulud 2.0 worm, and new intelligence on APT groups like Tomiris and those targeting industrial sectors.
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