Yahoo! has offered $24,000 to a security researcher for finding out and reporting three critical security vulnerabilities in its products including Yahoo! Stores and Yahoo!-hosted websites. Mark Litchfield, a bug bounty hunter who often works with different companies, discovered three critical vulnerabilities in Yahoo!’s products. The first and most critical vulnerability gives hackers full administrator access to Yahoo!’s e-commerce platform, Yahoo! Small Business, a portal that allows small business owners to create their own web stores through Yahoo! and sell merchandise.
Source: https://thehackernews.com/2015/03/yahoo-bug-bounty.html