Websites went offline as operators addressed critical vulnerabilities in PHP, a programming language used across much of the internet. Reports said AI helped researchers discover the bugs; one estimated that about 70% of websites use PHP and could be vulnerable to attacks. The flaws affected sites including 4chan, DeviantArt and Wikipedia.
WHO:Website operators and security researchers
WHAT:Website operators took sites offline while addressing critical PHP vulnerabilities discovered with AI.
WHEN:Oct 21, 2026
WHERE:Worldwide
WHY:Operators took websites offline to protect them while addressing critical PHP vulnerabilities.
Reporting from 11 identified publishers across this event arc.
