As many as 50,000 websites have been remotely commandeered by attackers exploiting a recently patched vulnerability in a popular plugin for the WordPress content management system, security researchers said Wednesday.
As Ars reported in early July, the vulnerability in MailPoet, a WordPress plugin with more than 1.7 million downloads, allows attackers to upload any file of their choice to vulnerable servers. In the three weeks since then, attackers have exploited the bug to install a backdoor on an estimated 30,000 to 50,000 websites, some that don't even run WordPress software or that don't have MailPoet enabled, according to Daniel Cid, CTO of security firm Sucuri.
"To be clear, the MailPoet vulnerability is the entry point," he wrote in a blog post. "It doesn't mean your website has to have it enabled or that you have it on the website; if it resides on the server, in a neighboring website, it can still affect your website." In an e-mail to Ars, he elaborated:
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