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A critical PHP vulnerability, discovered with AI assistance, has triggered emergency shutdowns of government and institutional websites worldwide, including in Europe, the US, and Japan. The flaw, which could allow system takeover without authentication, affects roughly 70% of global websites, though no actual hacking damage has been confirmed yet. South Korea's government has asked companies to apply security measures and is reviewing emergency patch support, while a patch distributor, Chaingard, accidentally leaked the patch about six hours early, raising further concerns. Yonhap reports that AI found the flaw, which human researchers had failed to prove for over a decade, marking a shift in cybersecurity. Korean media emphasize the 'sword and shield' dynamic, with Chosun Ilbo noting fears that hackers could now use AI for large-scale attacks. The Korea Times reports that PHP developers announced the issue on Wednesday, and some European countries have taken systems offline as a precaution.