Yahoo Inc reported the theft of 400,000 user names and passwords to access its own site as well as those of other companies, saying that hackers had taken advantage of a security vulnerability in its computer systems.
Company spokeswoman Dana Lengkeek did not identify the other companies whose credentials were stolen or say how many of the stolen logins were for Yahoo’s sites. The theft comes in the wake of a breach reported last month by the business networking service LinkedIn (LNKD.N), which resulted in the release of some 6.4 million member passwords.