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Google Cloud and Wiz Research disclosed two critical PHP vulnerabilities on Oct. 21, 2026, with a CVSS score of 9.2. The flaws affect versions 5.4 through 8.5.11, allowing unauthenticated remote code execution. Google urges users to upgrade to PHP 8.2 or newer immediately, as older versions remain unpatched.
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Summary by ByteBrief
PHP Warns of Critical Flaws Ahead of Patch

PHP discloses a critical memory-management vulnerability, dubbed "PHP2Shell", that affects up to 70% of websites, discovered using GPT-5.6 Sol in August (Robert McMillan/Wall Street Journal)
AI Helps Find Critical PHP Flaw