AI Models Found PHP Zero-Day Days Before Disclosure, Patches Released

On October 21, 2026, the PHP project released emergency patches for two critical remote code execution vulnerabilities, CVE-2026-109618 and CVE-2026-109619, collectively called PHP2Shell. The flaws, rated 9.2 on CVSS v4.0, affect PHP versions back to 5.4 and sit in PHP's core engine, so applications like WordPress, Drupal and Joomla are vulnerable unless PHP itself is patched. Security firms Calif and Wiz Research independently used AI models, including OpenAI's GPT-5.6 Sol, to identify the bugs in August, weeks before public disclosure. A proof-of-concept exploit appeared on GitHub within hours of disclosure, making exploitation a low barrier for attackers.
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