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PHP2Shell – critical security flaws in PHP

Two serious PHP security flaws put web servers worldwide under pressure. The key question isn't just whether the website is up to date – it's who's responsible for keeping it secure, and is your website protected?

Ask your web host today: is our PHP installation protected against CVE-2026-109618 and CVE-2026-109619? These are two critical security flaws, collectively known as PHP2Shell, published on October 21, 2026, which under certain circumstances can let an attacker execute code on the server without logging in first.

You can be running the latest version of WordPress, fully updated plugins, and a website that works flawlessly, and still be vulnerable if the PHP running on the server hasn't been security-patched.

What is PHP, and why does it hit so broadly?

PHP is the programming language that runs on the web server, handling forms, user login, content, and communication with the database. It's the foundation under millions of websites, including WordPress, Drupal, Magento, and many custom-built solutions made with, for example, Laravel.

When a serious flaw turns up in PHP itself, it can therefore affect wildly different websites across design, features, and code – the flaw sits a layer beneath all of it.

What is PHP2Shell?

PHP2Shell covers two vulnerabilities in PHP's own core runtime, registered as CVE-2026-109618 and CVE-2026-109619. Both carry a severity score of 9.2 out of 10 under CVSS v4.0 and can lead to Remote Code Execution (RCE) without prior login.

The flaws come down to PHP's internal memory handling. If PHP runs out of memory mid-request (CVE-2026-109618), internal data structures can be left in an invalid state, and the subsequent cleanup can trigger an exploitable memory error. Under certain conditions PHP can also retain a reference to memory that's already been freed (CVE-2026-109619) – if that reference is used later, it can leak data or run foreign code.

The serious part is that, on some server setups, the attack can be triggered before the website's own PHP code even runs. An ordinary security check in, say, WordPress or Laravel therefore can't be expected to stop it.

Why did it cause such a stir?

The vulnerabilities were identified with the help of AI-based code analysis – flaws that had sat in PHP for a long time could suddenly be found and investigated far faster. On October 20th, PHP's security team announced an emergency update, and the fixes shipped the next day. Several organizations and government bodies chose to restrict access to their systems as a precaution while they investigated and updated their installations.

When serious flaws become known, administrators need to be able to respond quickly. AI can help security researchers find flaws – but it also makes it easier for attackers to analyze them.

Which PHP versions are affected?

On October 21st, PHP released security fixes in the following versions:

Older PHP versions that are no longer officially supported don't receive new security fixes from the PHP project – though some hosting providers and Linux distributions still ship their own security patches for older versions. The version number alone isn't always enough to tell whether a server is protected. If a website is running an older PHP version, both its security status and the options for upgrading should be looked into.

A website needs maintenance – under the surface too

I work with PHP, WordPress, Laravel, and custom-built web solutions, and I regularly take over existing websites where the technical maintenance has been neglected: an old PHP version, plugins with no updates, code nobody maintains anymore.

When taking over an existing WordPress installation, the job is therefore also about understanding what's underneath. The same goes when considering a CMS switch – a new system doesn't automatically fix problems with server operations, security, and ownership. PHP2Shell is a concrete example of why that work matters: a website can work flawlessly for visitors while the server runs software with known security holes.

The danger isn't that your website uses PHP. It's if nobody knows which version it's running, whether it's security-patched, or who's responsible.

Five things to do

01_Find your PHP version.In WordPress it's under Tools → Site Health → Info → Server. On other systems it's typically found in the hosting panel or server configuration.

02_Ask your web host.Request confirmation that the server is protected against both PHP2Shell vulnerabilities – especially important on Debian or Ubuntu, where fixes can be baked into packages without changing PHP's overall version number.

03_Update, then test.Back up files and database, make sure PHP is security-patched, and test forms, payment, login, and integrations before pushing the changes to production. On a major version jump, check compatibility – older themes, plugins, and custom code may use functions no longer supported.

04_Check for signs of attack.A security update closes the hole but doesn't automatically remove any changes an attacker may already have made. If you suspect compromise: check server logs, unknown files, admin users, and unusual activity.

05_Agree on who's responsible.Who updates PHP? Who monitors the server? And who responds when a critical security advisory is published? That should be agreed before a problem happens.

Further reading

PHP – official security releasesthe latest versions and security fixes.

PHP – supported versionswhether your version still receives security updates.

Akamai – Understanding PHP2Shellthe memory bugs and attack prerequisites in detail.

JFrog – PHP2Shell Technical Analysisespecially on PHP sessions, uploads, and internal serialization.

PHP – official security advisorypatched versions and temporary mitigations.

WordPress – How to update PHPofficial guidance on upgrading PHP on a WordPress website.

Laravel – Server requirements and deploymentPHP compatibility and running Laravel applications securely.

Drupal – PHP requirements and compatibilitywhich PHP versions a Drupal installation supports.

Magento / Adobe Commerce – System requirements and PHP versionsofficial overview of supported versions and server requirements.

CMS solutions

If you're unsure about the technical state of your website, I'm happy to help build an overview of PHP, server environment, updates, and maintenance.

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Curriculum Vitae ↓

Profile Image

Paul Nybo Andersen

Profile_

49 years old, CTO, graphic designer, and full-stack developer (LAMP/LEMP) with 27 years of experience in developing digital solutions for a broad target group of companies.

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01_Services_

How I can help

I combine design and development into solutions that are simple to use and easy to maintain.

PHP • Laravel • MySQL • JavaScript

Web development

From database and backend to frontend, integrations and hosting.

UX • Figma • Prototypes • Testing

Web design & UX

Interface design that has to work for the user and the business alike.

Visual identity • Design systems • Print

Visual identity

Visual identity for companies that need to look like something you can rely on.

WordPress • Umbraco • Magento

CMS solutions

Content systems built for the people working in them every day.

Core Web Vitals • SEO • Caching

Performance & SEO

Websites that load quickly – including on a phone on a poor connection.

Architecture • Technology choice • Sparring

Technical consulting

For when a technical decision has to be made and you have nobody to test it against.

02_Case: Lifeguard Health ApS_

8 years with Lifeguard

CTO & Co-Founder

From 2015 to 2023, I was CTO and co-founder of Lifeguard Health ApS. Here, I worked on the development of a digital health platform that combined technology, data and personal coaching. The role included everything from product development, UX and software architecture to management of development teams, operations and business development. The eight years at Lifeguard shaped my approach to both technology, products and people and today form the foundation for much of what I work with.

Watch Lifeguard's Core-story →

Lifeguard presentation_1_4_

Slides #1 showing my last job
Slides #2 showing my last job
Slides #3 showing my last job

03_Employment_history_

My experiences

From 1999 to 2026, I have worked in different roles with design, technology, and digital business. Here are 10 snapshots of that experience — the tasks I have solved, and the skills I have used along the way.

See them as cards, or explore periods and overlap on the timeline.

Experiences_

Image from my time at ESGRapporter

2024-2026, CTO & Co-founder

ESGRapporter

Now: ESGRapporter ApS.

We built the ESG reporting platform in Laravel, and I carried the technical responsibility for the direction, the reporting side and everyth ..

Image from my time at Revolvo

2024-2026, Senior Developer • UI/UX • Design

Revolvo

Now: Revolvo Aps. + BmyGuest ApS.

I handled development, UI/UX and graphic identity. 60% of my time went to BmyGuest and IDoMeetings, which Revolvo co-owned.

Image from my time at Lifeguard

2015-2023, CTO & Co-founder

Lifeguard

Now: Lifeguard Health ApS.

I built the LifeScore platform in Laravel with consent-based access to health data and an app for the wristband, and handled all UX and desi ..

Image from my time at VitalityGuard

2016-2018, CTO & Co-founder

VitalityGuard

Now: FIDIMI

We ran the Lifeguard platform white-labelled through a joint venture with Dansk Sundhedssikring. Maersk was the biggest client.

Image from my time at ContentCPH

2010-2015, Senior Digital Wizard

ContentCPH

Now: Charlie Tango

I built 60+ Facebook apps in PHP for Samsung, IKEA and H&M. The Nik & Jay campaign for Samsung won Danish Internet Awards 2014.

Image from my time at BOCCA WIRED

2009-2010, Freelance developer

BOCCA WIRED

Now: BOCCA

I built campaign sites for Movia and the Danish Heart Foundation, among them Overraskende hurtig, which took bronze at the Creative Circle A ..

Image from my time at EuroRSCG

2008-2010, Inhouse Freelance developer

EuroRSCG

Now: Havas Danmark

I won the agency's digital work back from the competitors and built an iPhone site and interactive product tools for GN/Jabra.

Image from my time at Makazilab

2005-2006, Co-founder & developer

Makazilab

Now: MIND SWITCH

Co-founder of Makazilab, where I built the technical side of three educational concepts on intelligence types, entrepreneurship and creativi ..

Image from my time at Bandits Inc.

1999-2026, Sole proprietorship

Bandits Inc.

Now: Audiotracking v/Paul Nybo Andersen

My own sole proprietorship since 1999. Through it I have sold web development to agencies that had the graphics but lacked the developer.

Image from my time at Audio Management

1999-2003, Co-founder & Digital Director

Audio Management

Now: Audiomanagement ApS

Co-founder of Audiomanagement, where we developed SoundIdentity® — sound branding and sound design for companies like Bang & Olufsen and bra ..

Now 2025 2020 2015 2010 2005 2000

Select an experience to read more

04_Skills + Stack_

My qualifications

As shown in the previous section, I have dealt with a wide range of tasks and taken on many different job roles, ranging from sound engineer to photographer, graphic artist, web developer, and CTO. The common feature in all of them has been my passion for creating meaningful experiences and my drive to create something unique.

In my approach, I have always been open to exploring new solutions to existing challenges, and I have never been afraid to acquire new knowledge. This has resulted in a wide range of skills that I have put together over time.

I have tried to list the most relevant ones here.

Rating

- " This is what I do best".

- " I'm pretty good at it".

- " I can do this just fine".

- " It's not what I'm best at, but I can if necessary".

- " I'm not good at it - but I'm willing to learn".

05_Writing_

Notes from the work

2026-11_

PHP2Shell – critical security flaw in PHP

Two serious PHP security flaws put web servers worldwide under pressure. The key question isn't just whether the website is up to date – it's who's responsible for keeping it secure, and is your website protected?

2026-11_

Web accessibility is more than contrast and alt text

Contrast and alt text are just the beginning. The rest shows up the first time someone tries to use the site without a mouse.

2026-10_

A good brief makes the invisible decisions visible

"I assumed that was included."

2026-09_

Should we build AI into our product?

"We need some AI in there." That might be the right call. I'd start by figuring out which problem the technology is actually meant to solve.

2026-09_

A good design doesn't start in Figma

I can open Figma and start drawing a website right away. It's rarely a good idea. Because before I know what the page should look like, I want to know what it should get someone to do.

2026-08_

What is technical SEO – and what isn't it?

When a page isn't found on Google, it's tempting to start with the copy. But before I'd change the content, I'd make sure Google can actually find the page, read it, and understand which version should show up in the search result. That's a large part of what technical SEO is about - technical problems can stand in the way of even good content.

2026-08_

What does a website cost?

– and why are two quotes almost impossible to compare?

2026-08_

Why is my website slow?

A slow website can be a 4 MB image. It can also be 10 other things. The first question isn't what the site is built in – it's where the time actually goes.

2026-06_

Which CMS should you choose?

WordPress, Umbraco, Drupal, Shopify, Webflow, or something else entirely? My slightly annoying answer is usually: What is it for?

2026-05_

A visual identity has to work without the designer

A visual identity is easy to make look good on a screen. It gets harder when it has to go out into the real world – into a PowerPoint, onto an invoice, onto a sign someone edits themselves three years later.

2026-05_

Is my job as a graphic designer under threat?

AI-generated graphics have moved out of the computer and into the real world. The question is no longer whether AI can make graphics. It can. The question is what is then left of the graphic designer's work.

2026-04_

When should you switch CMS?

Most people ask the wrong question first. The interesting one is not which CMS is best – it is whether the CMS is even the problem.

2026-04_

WordPress — the short version

The thing that makes WordPress easy to extend is also the reason behind most of the problems you meet in older installations.

2026-03_

WordPress vs. headless — the difference in practice

Headless gives you freedom by taking things apart. But whatever you take apart has to be put back together again.

2026-02_

Sometimes I design in VS Code

Not because I have given up on Figma. But because sometimes it is faster to see whether an idea holds up in the browser than on a canvas.

2026-01_

The most expensive code is the code you never had to write

Not all expensive code is bad code. Some of the most expensive decisions I have been part of were well-written solutions to problems nobody had yet.

2025-12_

From coder to reviewer – how AI changed the workflow

In the short term, AI does not change what I know – it changes my workflow.

2025-11_

The art of inheriting a WordPress installation

8 years, 34 plugins and a theme nobody dares touch. The job does not start by fixing anything – it starts by working out what is in use.

2025-08_

Ctrl, Cmd and C#

A language is learnable. It is the domain and the codebase that take time – and two machines that cost more attention than the syntax.

2025-02_

After a bankruptcy

Valued at 35 million at its height, bankrupt in December 2023, a new company seven months later. This is what sat in between – and what I took with me.

2024-11_

The report that had to sit in reception

When we built ESGRapporter, the competition had heavier calculation engines than we did. We bet somewhere else: on what the user was left holding being worth showing to someone.

06_When I'm not working_

A bit about me

I was born and raised in Copenhagen. But after a few years living with small children in an apartment in Østerbro, my girlfriend and I chose to move to a house in the suburb. We've lived in Hellerup for 11 years now, in a less pulsating neighborhood but no further away from Copenhagen than you can hop on the bike and then you're back.

I often do the latter; it's all about inspiration and new impressions. For the same reason, I still try to combine these trips with my passion for shooting photos. But since work has always been my hobby, it has been a challenge to find a balance between leisure and work projects.

When I'm not working, I spend a lot of time playing and listening to music. Unfortunately, over time, it has mostly become listening, which has been a very expensive but also rewarding passion.

The common feature of all my passions is the desire to create something. I hope this can benefit you.

TT38 profil

+25 years of experience with digital products ↓

Available for consulting, development, digital products and technical leadership.