DKDKCISSP
Threat Research

Install critical PHP safety update or go offline, cyber chiefs tell websites

Organisations which rely on the PHP programming language are being told they should install a significant software update today - or consider taking their websites offline.

DKCISSP News DeskBBC News21 Oct 2026, 5:39 pm3 min read
Install critical PHP safety update or go offline, cyber chiefs tell websites
Image courtesy of BBC News. Original report
DKCISSP REPORT

Organisations which rely on the PHP programming language are being told they should install a significant software update today - or consider taking their websites offline.

Such a cyber-attack could potentially allow hackers to install malware and take down websites.

The PHP Foundation, which supports it, is issuing updates which address them on Wednesday afternoon.

Dane Knecht, chief technology officer at internet infrastructure firm Cloudflare, said he was "seeing early attacks emerging and are updating mitigations as new vectors show up".

The Netherlands' cyber-security agency says it is taking its own website offline due to the vulnerabilities identified.

It ​quietly powers WordPress, Drupal, Joomla, and Magento sites, shared hosting platforms, control panels, and an awful ⁠lot of software that doesn't even advertise that it runs PHP under the hood," cybersecurity company Huntress said.

Similarly the website of the Tweede Kamer, the lower house of the nation's parliament, has become inaccessible.

The European Union Computer Emergency Response Team (CERT-EU) said the risk scores given to the vulnerabilities "indicate the potential for unauthenticated remote code execution".

Two critical vulnerabilities with PHP, which is widely used across the internet, have been identified.

It is not yet clear which versions of the programming language are affected, but CERT-EU said it could affect all versions of it dating back to PHP 5 onwards - which launched in 2004.

What happened

Organisations which rely on the PHP programming language are being told they should install a significant software update today - or consider taking their websites offline.

Such a cyber-attack could potentially allow hackers to install malware and take down websites.

What changed

The PHP Foundation, which supports it, is issuing updates which address them on Wednesday afternoon.

Dane Knecht, chief technology officer at internet infrastructure firm Cloudflare, said he was "seeing early attacks emerging and are updating mitigations as new vectors show up".

Who is affected

The Netherlands' cyber-security agency says it is taking its own website offline due to the vulnerabilities identified.

It ​quietly powers WordPress, Drupal, Joomla, and Magento sites, shared hosting platforms, control panels, and an awful ⁠lot of software that doesn't even advertise that it runs PHP under the hood," cybersecurity company Huntress said.

Why it matters

Similarly the website of the Tweede Kamer, the lower house of the nation's parliament, has become inaccessible.

The European Union Computer Emergency Response Team (CERT-EU) said the risk scores given to the vulnerabilities "indicate the potential for unauthenticated remote code execution".

Technical details

Two critical vulnerabilities with PHP, which is widely used across the internet, have been identified.

It is not yet clear which versions of the programming language are affected, but CERT-EU said it could affect all versions of it dating back to PHP 5 onwards - which launched in 2004.

Response

The NCSC said once organisations have installed the update, they should "continuously monitor for security updates from third-party software vendors, including for appliances and services that may bundle PHP".

The UK's National Cyber Security Centre (NCSC), as well as its counterparts in the EU and Australia have urged those who use PHP to apply the fixes as soon as they become available.

Attribution

BBC News: Organisations which rely on the PHP programming language are being told they should install a significant software update today - or consider taking their websites offline.

What to watch next

Watch for updated vendor guidance and fixed-version details.

MORE IN THREAT RESEARCH

More cybersecurity reporting

Critical security issue affecting PHPNCSC-UK · 21 Oct 2026, 5:30 amGo Issues Emergency Update Blocking Eight CA Keys Over Undisclosed Security ConcernsThe Hacker News · 20 Oct 2026, 5:02 pmMicrosoft fixes classic Outlook bug that hid Copilot buttonsBleepingComputer · 19 Oct 2026, 6:14 pmRussian man linked to deadly London hospitals hack arrestedBBC News · 16 Oct 2026, 9:01 pm