Yahoo says usernames and passwords of its email customers have been stolen and used to access accounts, but the company isn't saying how many accounts have been affected.
The company said in a blog post Thursday that "The information sought in the attack seems to be names and email addresses from the affected accounts' most recent sent emails."
"Security attacks are unfortunately becoming a more regular occurrence," Yahoo senior vice president for platforms and personalisation products Jay Rossiter said in the blog post.
"We regret this has happened and want to assure our users that we take the security of their data very seriously."
A malicious computer program armed with Yahoo Mail passwords and usernames apparently slipped into accounts aiming to glean names and addresses from messages that had been sent, according to Rossiter.
Yahoo recently discovered the invasion and suspected that the passwords were snatched from a third-party database that the company did not disclose.
"We have no evidence that they were obtained directly from Yahoo's systems," Rossiter said.
Yahoo said it was working with federal authorities to investigate the breach.
The company says it is resetting passwords on affected accounts and has "implemented additional measures" to block further attacks.
http://www.smh.com.au/it-pro/security-it/yahoo-email-account-passwords-stolen-20140131-hvanw.html
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