OpenAI GPT-5.6 Sol and Google Gemini 4 Argon Discover PHP Vulnerability Affecting Millions of Websites
OpenAI's GPT-5.6 Sol discovered a critical PHP vulnerability affecting millions of websites in the Patch-the-Planet initiative, while security firm Wiz independently discovered the same batch of vulnerabilities using its self-developed Wiz Atlas platform together with Gemini 4 Argon and GPT-5.6 Sol. Wiz said Gemini 4 Argon was particularly useful in vulnerability discovery, exploit development, attack detection construction, and patch verification, and tools are already available on GitHub for server operators to check whether their PHP versions are affected. The fix took two months and was coordinated in five phases, with participants including PHP developers, Wiz, Cloudflare, and U.S. agencies such as CISA and the White House; OpenAI expects the scale of such discoveries to increase substantially in the coming months and cautions that the same capabilities could also be exploited by attackers.
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The incident demonstrates the division of labor among AI models in real-world vulnerability discovery, as well as the risk of the same capability being used to amplify attacks.
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AI models from OpenAI and Google found a critical PHP vulnerability that could affect millions of websites worldwide.
GPT-5.6 Sol tracked down the flaw as part of the Patch-the-Planet initiative , which OpenAI calls one of the "most impactful security issues in recent memory." The model spotted the vulnerabilities before attackers did, giving developers and security vendors a window to respond. A tool on GitHub now lets server operators check whether their PHP version is affected.
Security firm Wiz found the same flaws independently, using its own Wiz Atlas platform alongside Google's Gemini 4 Argon and GPT-5.6 Sol. Gemini 4 Argon proved especially useful for finding the vulnerability, developing exploits, building attack detection, and validating the patch, according to Wiz.
AI lowers the bar for attackers
An exploit that worked against one specific PHP installation used to require significant effort to adapt to other versions and configurations, Wiz explains. Large language models remove that barrier because they can automatically adjust exploits across different PHP versions, configurations, and memory layouts. "This significantly lowers the barrier to scaling attacks across different deployments," the firm writes, adding that "vulnerabilities that once seemed impractical to exploit become viable targets."
The fix was coordinated over two months across five phases, involving PHP developers, Wiz, Cloudflare, and US agencies including CISA and the White House. OpenAI is proposing this process as a repeatable framework for future AI-driven security discoveries.
The company expects findings on the scale of the PHP2Shell flaw to "increase sharply in the coming months," but warns that the same AI capabilities that find vulnerabilities can help attackers too. The discovery feeds into a months-long debate over AI models' offensive and defensive cybersecurity capabilities.