AI Uncovers Critical PHP Vulnerabilities Exposing 70% of Global Websites to Server Takeover

Reviewed byNidhi Govil

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AI models from OpenAI and Google discovered two critical security flaws in PHP programming language that had remained hidden for over a decade. The vulnerabilities, dubbed PHP2Shell, affect an estimated 70% of websites worldwide and allow unauthenticated attackers to execute code and seize control of servers. The National Security Agency issued urgent warnings as governments scrambled to patch systems or take them offline.

AI Models Detect Decade-Old Critical Security Flaws in PHP Programming Language

Security researchers using OpenAI GPT models and Google's AI systems discovered two critical security flaws in PHP, a programming language that powers an estimated 70% of all websites globally

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. The vulnerabilities, tracked as CVE-2026-109618 and CVE-2026-109619, each rated 9.2 on the CVSS v4 scale, had existed undetected for more than a decade before AI in cybersecurity tools identified them

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. Security firm Calif found the first flaw in August using OpenAI's GPT-5.6 Sol model during an audit funded through OpenAI's Patch the Planet initiative, while Google-owned Wiz independently discovered the same vulnerabilities weeks later using Wiz Atlas, Google's Gemini 4 Argon and GPT-5.6 Sol

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Source: The Next Web

Source: The Next Web

National Security Agency Issues Urgent Warnings on Server Takeover Risk

The National Security Agency, along with UK authorities and the EU's CERT-EU, issued urgent warnings Wednesday advising all organizations using PHP to immediately update their systems or take them offline

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. The NSA emphasized that these PHP vulnerabilities often provide direct access to a server's file system or database, and recommended organizations take systems offline if immediate patching wasn't feasible

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. The UK's National Cyber Security Centre warned that the flaws could allow hackers to take control of website servers without needing passwords or login credentials

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. Japan's Prime Minister Sanae Takaichi urged immediate action, stating on social media that temporarily suspending websites could be an effective risk reduction measure if patches couldn't be applied promptly

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Emergency Security Patches Released as Websites Go Dark Across Europe

PHP developers released emergency security patches on Wednesday morning, including versions 8.5.12, 8.4.27, 8.3.36 and 8.2.35, to address the memory-safety flaws

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. The release came earlier than scheduled after details leaked in a post to Hacker News, forcing PHP to bring the fix forward from its planned 14:00 UTC announcement

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. Government, hospital, and school websites across Europe went dark to protect themselves, including the Finnish health agency, Port of Rotterdam, Paris police force, and 4Chan

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. The bookmarking service Pinboard, GrapheneOS forum, and streaming tool OBS pulled parts of their sites down, while Laravel halted its Cloud deployments to rebuild on patched images

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. Cloudflare activated web application firewall rules for all customers, including free accounts, at 03:02 UTC—approximately nine hours before official disclosure—and monitored attackers mutating their payloads against the rules

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Source: NYT

Source: NYT

Unauthenticated Code Execution Threatens Vulnerabilities in 70% of Websites

The PHP2Shell flaws allow unauthenticated attackers to execute code on servers running the PHP programming language, with the highest risk for sites running Apache with mod_php, where an unauthenticated request can trigger the vulnerability before any application code runs

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. PHP's widespread presence stems largely from WordPress, the most widely used website-building platform, which is written primarily in PHP and relies on it to function

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. The flaws affected PHP versions 5.4 and later, spanning more than a decade of releases

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. Volker Dusch, a security engineer at the nonprofit PHP Foundation, called it the most severe issue PHP had faced in more than a decade, comparing it to Heartbleed, the 2014 bug that forced a global patching race

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. Wiz compared the critical security flaws to both Heartbleed and Log4Shell

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Dual Role of AI Highlights Defender's Window and Attacker Capabilities

OpenAI characterized the discovery as evidence that AI discovered security flaw capabilities can identify internet-scale vulnerabilities before criminals exploit them, calling this a "Defender's Window"

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. "Given the severity of these flaws and PHP's widespread use, we consider this one of the most impactful security issues in recent memory," OpenAI stated, adding that it highlights how AI can uncover security flaws with internet-scale impact while also helping attackers rapidly develop offensive tools and exploits

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. Calif offered a more measured perspective, noting that knowing PHP's history mattered more than the model itself and that "no model is simply capable of unearthing 'all bugs' with simple prompts"

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. The cybersecurity crisis has intensified as the rate of software vulnerabilities identified per month has doubled over the past year, while the time hackers need to exploit those vulnerabilities has fallen from weeks to hours

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Source: Mashable

Source: Mashable

OpenAI Launches Patch the Planet Initiative with $1 Billion Commitment

Following the PHP2Shell disclosure, OpenAI announced its Patch the Planet framework aimed at fostering global cooperation to find and fix vulnerabilities lurking in old software

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. The company committed $1 billion to subsidize access to Daybreak, its cybersecurity auditing platform, for organizations with limited security resources protecting essential services

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. OpenAI stated that PHP security issues were just two "among several significant vulnerabilities" it has already found, expecting "similar findings to increase sharply in the coming months"

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. The initiative invites third-party cyber professionals to review the approach, challenge assumptions, and identify gaps in a crowd-sourced mission to scour the internet for hidden security flaws before malicious actors discover them

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. Recent widespread attacks on South Korean and Japanese websites were reportedly executed by a single Chinese cybercriminal using AI to target more than 1,000 websites, demonstrating how attackers are rapidly adopting these capabilities

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