Security researchers spent 6 days doing their Chromework, built 1B user exploit

Researchers at security startup Xbow used OpenAI's GPT-5.6 Sol model to help chain three zero-day vulnerabilities in Chrome into an exploit capable of executing code outside the browser's sandbox on Windows machines. Xbow estimates that this could affect about one billion users worldwide. Google fixed all three, and paid the Xbow team a $250,000 bounty, its top reward for a Chrome full-chain exploit. The payout also proves a nice return on investment for the human bug hunters - Brendan Dolan-Gavitt, Andres Luksenberg, Baul Lee, and Willem Pinckaers - who spent just six days during the Black Hat and DEF CON conferences and about $40,000 in token charges to discover the vulnerabilities and build the attack chain. “The number on the check is impressive, but the time it took our team, with the help of a publicly available AI model, to break in is even more impressive,” Xbow CEO and founder Oege de Moor said on Tuesday. …