OpenAI announced in a press release on Oct. 21 that researchers working under its “Patch the Planet” cybersecurity initiative used its AI model GPT-5.6 Sol to uncover critical security vulnerabilities in PHP (an open-source programming language that runs an estimated 70% of the internet). After the discovery, the company says it coordinated a coalition of researchers, PHP maintainers, security providers, and government cybersecurity agencies to fix the issues over two months. The company attributed the lengthy timeline to the task's complexity, which required major changes to the PHP engine.
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The PHP Foundation has released patched versions PHP 8.2.35, 8.3.36, 8.4.27, and 8.5.12 to fix the vulnerabilities. PHP 8.1 and older versions will not receive official fixes. The coordinated release was originally scheduled for Oct. 22, but was brought forward to Oct. 21 following premature disclosures on Oct. 20, which led to public outcry.
OpenAI says every site using PHP can now safely upgrade its version to stay secure. The company highlights the incident — which it considers one of the biggest cybersecurity discoveries of 2026, given PHP’s ubiquity — as an example of the Defender's Window concept in action. OpenAI introduced the concept after its models hacked Hugging Face ; it describes a critical, narrow timeframe during which organizations can use advanced frontier AI models to find, patch, and strengthen their cybersecurity defenses before those same AI-driven attack capabilities become widely available to malicious threat actors.
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