There are currently over 1 Billion websites on the web. That number is growing as more of the world gets connected and technology makes it easier for people to have a voice and online presence through things like a website. This growth is being enabled by the explosion of technologies like open-source Content Management Systems (CMS). Over a third of the websites online are powered by four key platforms: WordPress, Joomla!, Drupal, and Magento. -WordPress is leading the CMS market with over 60% market share.
This explosion and dominance by WordPress is facilitated by global-user adoption, a highly extensible platform and focus on end users. Other platform technologies have experienced growth in more niche markets, like Magento in the online commerce domain with large and enterprise organizations, and Drupal in large, enterprise, and federal organizations. This user adoption however brings about serious challenges to the internet as a whole as it introduces a large influx of unskilled webmasters and service providers responsible for the deployment and administrations of these sites.
This assessment is amplified in our analysis, which shows that out of the 11,000 + infected websites analyzed, 75% of them were on the WordPress platform and over 50% of those websites were out of date. Compare that to other similar platforms that placed less emphasis on backwards compatability, like Joomla! and Drupal, the percentage of out-of-date software was above 80%. As of March 2016, Google reports that over 50 million website users have been greeted with some form of warning that websites visited were either trying to steal information or install malicious software.
In March 2015, that number was 17 million. Google currently blacklists close to ~20,000 websites a week for malware and another ~50,000 a week for phishing. PhishTank alone flags over 2,000 websites a week for phishing. These numbers reflect only those infections that have an immediate adverse effect on the visitor (i.e., Drive by Download, Phishing) and do not include websites infected with Spam SEO and other tactics not detected by these companies.
Source: Sucuri Website Hacked Trend Report