Source: thehackernews.com – Author: .
Cybersecurity researchers have uncovered a new stealthy backdoor concealed within the “mu-plugins” directory in WordPress sites to grant threat actors persistent access and allow them to perform arbitrary actions.
Must-use plugins (aka mu-plugins) are special plugins that are automatically activated on all WordPress sites in the installation. They are located in the “wp-content/mu-plugins”
Original Post url: https://thehackernews.com/2025/07/hackers-deploy-stealth-backdoor-in.html
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