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A critical PHP vulnerability, found with AI assistance, has triggered worldwide emergency responses. The flaw, which could let hackers access servers without login, was discovered after being undetected for over a decade. European government sites, including Geneva University, went offline as a precaution, and the U.S. NSA advised sites to go offline if they can't patch immediately. PHP developers released an urgent fix on October 21, and Korea's KISA recommended security updates the same day. Korean media emphasize that while AI found the flaw, hackers could also use AI for large-scale attacks, raising concerns about future cyber threats.