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A critical vulnerability in PHP, used by about 70% of the world's websites, was discovered through AI analysis, prompting governments and companies worldwide to temporarily shut down sites as a precaution. The flaw, which could let hackers take over servers without authentication, was found by AI after human researchers failed to prove it for over a decade. European government sites, including Geneva University, went offline on October 21, and the U.S. NSA advised going offline if patches couldn't be applied immediately. The PHP developers released an emergency patch on October 21, though they admitted they had known of signs two years ago but couldn't fix it. No actual hacking damage has been confirmed yet, but Korean media report that AI's role is changing the cybersecurity landscape, with concerns that hackers could also use AI for large-scale attacks. South Korea's government is guiding major companies on PHP security measures and considering emergency patch support.