Brian Krebs has located and published a sales pitch from a hacker who has found a zero-day exploit allowing him to steal cookies from Yahoo webmail users, granting access to their accounts.
"I'm selling Yahoo stored xss that steal Yahoo emails cookies and works on ALL browsers," wrote the vendor of this exploit, using the hacker handle 'TheHell.' "And you don't need to bypass IE or Chrome xss filter as it do that itself because it's stored xss. Prices around for such exploit is $1,100 – $1,500, while I offer it here for $700. Will sell only to trusted people cuz I don't want it to be patched soon!"