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A critical security vulnerability has been discovered in PHP, a programming language used by about 70% of websites worldwide, prompting emergency responses from governments and companies. Yonhap reports the flaw allows hackers to execute malicious commands on servers without an administrator password, and the U.S. NSA has advised organizations to go offline if they cannot immediately update. In Korea, the government issued a 'caution' cyber alert, but Chosun Ilbo reports that 82% of domestic PHP servers run outdated versions that cannot be patched, raising concerns about higher risk in Korea. The Korea Times notes the Korean government has sent a nationwide security alert to businesses and website operators.