AI-found PHP flaws knock sites offline and threaten parts of the old web

Critical bugs in PHP, the language behind much of the web, have forced sites from DeviantArt to government agencies offline while they rush to patch.

1 min read

The Verge

At a glance

severity rating out of 10
9.2
roughly how long the flaw existed
20 years
attack attempts on Cloudflare’s network
Millions
What’s new
Two remote code execution flaws, CVE-2026-109618 and CVE-2026-109619, affect PHP from version 5 onward. Patches came out on 21 October, and a researcher using OpenAI’s GPT-5.6 Sol helped find the flaws.
Who it affects
Anyone running a PHP site, including WordPress and Drupal sites, and especially older sites that no one maintains any more.

Security firm Wiz says exploiting the bug once took an exceptionally complex chain of steps, but powerful AI models have made that kind of work much easier. Amazon’s threat team says it saw an exploit attempt on 17 October, days before the patch. The NSA’s cybersecurity team and the UK’s National Cyber Security Centre advised taking systems offline if they couldn’t update at once. Old services that can’t be patched, such as two long-running Japanese mobile games, are shutting down. The PHP Foundation says it knows of no successful remote code execution, but calls updating “imperative”.

Why it matters

This shows AI cutting both ways: models that help defenders find a decades-old flaw also make such flaws easier to exploit, and attacks surged within hours of the disclosure. It also exposes the web’s long tail of unmaintained software. Sites that nobody can update may simply disappear, taking pieces of internet history with them.

PHP: The three little letters wreaking havoc across the web

The Verge

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Summary by Second Order AI. Full reporting is at the original source.