How much of the web PHP2Shell touches PHP2Shell reaches most of the web because it lives in PHP itself, not in any one app. Sansec reports the vulnerable code dates to PHP 5.4 in 2012 and default configurations are exposed, so the risk is the language's entire footprint.
Measure
Figure
Source
Websites with a known server language that run PHP
70–80%
Kinsta, via CyberScoop
Same measure, August 2026
70.2% (65.9% among the top 1 million sit…