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A major cybersecurity threat prompted a scramble Wednesday to protect websites around the world. Government websites were among those temporarily taken offline as officials rushed to install security patches. Others remain offline entirely. At the center of the threat is a vulnerability involving PHP, a programming language used by millions of websites. The FBI and National Security Agency warned that hackers could exploit the flaw to take control of websites and potentially compromise sensitive information. OpenAI says its artificial intelligence models helped uncover the vulnerabilities.