Yahoo! Contributors Network (contributor.yahoo.com), the network of authors that generated the contents such as photographs, videos, articles and their knowledge to more than 600 million monthly visitors, was vulnerable to a Time based Blind SQL Injection vulnerability. The vulnerability was able to expose the database which carried sensitive and personal information of those authors who was participating and getting paid from their work. Yahoo! Security team responded positively and within a month they patched the vulnerability successfully. Unfortunately after that Yahoo! announced to shut down ‘Yahoo Contributors. Network’ due to its decreasing popularity and removed all the contents from the web, except some of the “work for hire” content may remain on the web.
Source: https://thehackernews.com/2014/10/sql-injection-vulnerability-in-yahoo.html