Hackers Exploit Vulnerability in Popup Builder Plugin for WordPress

In a concerning development for website owners and administrators, hackers have been exploiting a vulnerability in the popular Popup Builder plugin for WordPress, resulting in the infection of over 3,300 websites worldwide. This security flaw, officially tracked as CVE-2023-6000, allows malicious actors to execute cross-site scripting (XSS) attacks on websites that are using outdated versions of the Popup Builder plugin, specifically versions 4.2.3 and older. 

The vulnerability was initially disclosed in November 2023, raising alarm bells in the cybersecurity community. Despite this disclosure, many site administrators failed to promptly update their systems, leaving them vulnerable to exploitation by hackers. Now, the consequences of this oversight are becoming apparent, with Sucuri, a prominent cybersecurity firm, reporting a recent surge in attacks targeting WordPress sites through this vulnerability. 

At the core of the exploit is the injection of malicious code into the Custom JavaScript or Custom CSS sections of the WordPress admin interface. This injected code is then stored within the ‘wp_postmeta’ database table, allowing hackers to manipulate the behavior of the Popup Builder plugin. By leveraging event handlers within the plugin, such as popup open or close events, hackers can execute various malicious actions, including redirecting unsuspecting visitors to phishing pages or malware-dropping sites.

Sucuri’s analysis has revealed that the attacks originate from domains such as “ttincomi

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