A critical cybersecurity vulnerability discovered in the PHP programming language is triggering an urgent global response. Governments and companies worldwide are scrambling to secure their websites or, as advised, take systems offline. Amazon stated its systems were attacked multiple times on October 17 and 21 using the flaw, prior to the public warning. OpenAI called it "one of the most impactful security issues in recent memory," and cybersecurity firm Wiz estimates approximately 70% of the internet is affected.