Cybersecurity firm Trail of Bits developed a working PHP2Shell exploit that gains shell access on an unmodified MediaWiki installation, CEO Dan Guido said, countering claims that the newly disclosed PHP flaws are not easily exploitable. The firm noted that getting freed memory reused properly under normal traffic requires manual tinkering that large language models struggle to perform without expert guidance, which may explain why millions of automated attack attempts have produced no confirmed compromises.
The two memory corruption vulnerabilities, tracked as CVE-2026-109618 and CVE-2026-109619 and rated 9.2 on the CVSS v4.0 scale, allow unauthenticated remote code execution and process memory disclosure on servers running PHP, which powers roughly 70% of websites. Security researchers at Calif and Google’s Wiz discovered the decade-old flaws in August using OpenAI’s GPT-5.6 Sol and Google’s Gemini 4 Argon. Building the patch took 71 days and required changing 402 files and more than 11,000 lines of code in the core engine.
