Major websites and government portals have been forced offline after researchers discovered two severe security vulnerabilities in PHP, the programming language that underpins nearly 70 percent of the web. The flaws prompted services ranging from Wikipedia and DeviantArt to Finnish and Dutch government agencies to temporarily disable their platforms or rush out emergency updates. Cybersecurity authorities in the United States and the United Kingdom even advised organizations to disconnect affected systems if an immediate fix was not feasible.
PHP runs on millions of web servers around the world, powering virtually every platform built on WordPress. According to the PHP Group, the newly uncovered vulnerabilities allow unauthenticated remote code execution, meaning attackers can run malicious code, alter page content, and access stored databases without an administrator password. The two weaknesses involve memory errors during request handling: one triggers when an out-of-memory interruption leads the system to treat invalid data as valid, while the other allows leftover request data to linger in server memory and corrupt subsequent user sessions.
Although the underlying code has existed in PHP for roughly twenty years, exploiting it previously required an exceptionally complex chain of steps at the edge of human ability. That barrier collapsed when researchers began using advanced artificial intelligence models. An AI security group called Calif identified one of the flaws using GPT-5.6 Sol, while the cybersecurity firm Wiz independently discovered the issues using AI tools. Experts warned that the same machine intelligence that uncovered the bugs also makes it far easier for attackers to weaponize them against vulnerable servers.
With Cloudflare already observing initial attacks, cybersecurity specialists describe the incident as one of the most critical software vulnerabilities in recent history. While everyday internet users cannot patch web servers directly, website administrators are being urged to verify their software versions immediately. Hosting providers noted that older installations, including PHP 8.1 and earlier, will not receive official security fixes, leaving website owners with little choice but to upgrade to supported releases or shut down vulnerable sites until patches are applied.