Thousands of Sites with Popup Builder Compromised by Balada Injector

On December 11, 2023 WPScan published Marc Montpas’ research on the stored XSS vulnerability in the popular Popup Builder plugin (200,000+ active installation) that was fixed in version 4.2.3.

A couple of days later, on December 13th, the Balada Injector campaign started infecting websites with older versions of the Popup Builder. The attack used a freshly registered (December 13) domain specialcraftbox[.]com. At the current time of writing PublicWWW detects the injection on over 6,200 sites.

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