Cost of a Windows zero-day exploit? This one goes for $90,000

Ever wonder how much an exploit for a previously unknown vulnerability that affects all Windows versions costs on the black market? The answer, according to a recent offer seen on a cybercrime forum, is $90,000.The offer was observed by researchers from security firm Trustwave on an underground market for Russian-speaking cybercriminals, where users hire malware coders, lease exploit kits, buy access to compromised websites or rent botnets.Zero-day exploits -- exploits for unpatched vulnerabilit