Some visitors to Yahoo.com were infected with malware over the course of a few days, says Netherlands-based security firm Fox IT.
Yahoo's advertising network was recently hacked, and visitors were redirected to a malicious website at a rate of 300,000 per hour, according to Dutch security firm Fox-IT.
Yahoo is still working to bring its email service back online, a week after trouble first started. The outage appears to be unprecedented for an organization its size, and is a major source of embarrassment to the Web pioneer that was just starting to regain its credibility.
Google lost marketshare this month, but it wasn't Microsoft that made the gains.
Top news stories for Nov. 26, 2013.
Yahoo keeps trying new things and the latest is a tech journalism venture that appears to be part of an overall content-driven strategy.
Yahoo last Friday launched a bug bounty program, joining the ranks of companies such as Google, Microsoft and PayPal that already offer a monetary reward for reporting legitimate security flaws in their software.
The National Security Agency is able to eavesdrop on communication links to Google, Yahoo data centers, according to the latest revelation by former NSA contractor Edward Snowden reported by the Washington Post.
Top news for Oct. 31, 2013.
Google continues to control consumer search, even while Microsoft makes slow progress, but for now, not much changes when it comes to search engine marketshare numbers.