Artificial-intelligence tools helped find one of the most severe online bugs ever. Cyber experts are racing to patch it before hackers use AI to exploit it. First, artificial intelligence heralded the Bugmageddon. Now it is triggering an all-hands-on-deck cyber emergency. The creators of PHP, a technology that powers as much as 70% of the world’s websites, disclosed a critical security issue Wednesday that could be leveraged by hackers to take control of any system running its software. That would allow an attacker to steal information or launch a cyberattack on anyone visiting a hacked website.Security researchers found the vulnerability using...