Nearly 1 million WordPress sites are being hit by what is likely a single threat actor attempting to inject a redirect into the sites by exploiting a cross site scripting vulnerability.

The attacks were discovered by the WordFence Threat Intelligence Team, which noted that since April 28 the number of XSS attacks has been 30 times its normal rate. The team believes a single actor is behind the attacks based on the fact that the same payload is used in each attack. The payload is a malicious JavaScript that redirects visitors and takes advantage of an administrator’s session to insert a backdoor into the theme’s header.

Ameet Naik, security evangelist at PerimeterX, noted that an XSS attack, while being used for a redirect here, can lead to more serious issues.

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