Websites across Europe go offline after warning issued for critical software update

Government websites and businesses across Europe have been taken down in a bid to protect organisations after a critical software update was issued over vulnerabilities in programming language.

The developers of the PHP programming language, which is extensively used across the internet, said on Wednesday a set of new ​updates fixing two previously identified critical vulnerabilities was now ​live.

It strongly encouraged ‌users to update software immediately.

Those unable to apply key fixes to the widely used software should also consider taking their websites down, UK and international cybersecurity officials have warned.

Concerns have escalated in recent days that websites running software would be exposed to serious cyber intrusions.

PHP said both vulnerabilities were rated 9.2 on the CVSS v4.0 severity scale and urged users to "upgrade as soon as the release is available".

Government websites in Europe and ‌elsewhere went offline on Wednesday as organisations scrambled to protect their systems.

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French government websites were taken offline temporarily as it waited for the PHP fix. Users visiting these websites were told there was "ongoing maintenance".

Also, government agencies in the Netherlands and Finland were among those which took sites offline as a precaution.

The ‌Wikimedia Foundation, which ‌runs online encyclopedia Wikipedia, was one company on Wednesday which said it was ‌in the process of addressing ​security vulnerabilities in the PHP programming ​language.

The European Union ‌Computer Emergency Response Team (CERT-EU) said on Tuesday that the 9.2 rating indicated a risk of unauthenticated remote code execution, a type of flaw that can allow attackers to run malicious code on vulnerable systems without logging in.

It urged organisations to prepare for the immediate patching of affected assets and said those unable to do so should consider taking their sites offline.

Web hosting provider GoDaddy said the flaws could allow attackers to access affected servers which could potentially lead to data theft, website defacement or full system compromise.

The Australian Cyber Security Centre (ACSC) urged organisations to ​identify PHP systems in their environments, prepare to apply patches and monitor applications for ​signs of malicious activity.

Cybersecurity agencies in Britain and Japan are also among those urging PHP users to update immediately or take websites offline until patches can be applied.

Dane Knecht, the chief technology officer of Web and cloud security firm Cloudflare, said that attacks were already happening and Cloudflare was updating its firewall ‌rules as a stopgap measure.

He said on X: "We are seeing early attacks emerging and are updating mitigations as new vectors show up. This is a STOPGAP only. Patch as soon as PHP releases the update."

Don Smith, VP Threat Intelligence, Sophos Counter Threat Unit, said: "Security teams should prioritise internet-facing systems, confirming which versions are affected as soon as the official advisory is published, and apply the updates without delay.

"Threat actors move fast, especially with the help of AI and this will likely be a priority target for them over the coming hours and days so it is crucial organisations monitor PHP and web-server processes for unusual processes, command execution or other signs that an attacker may already have gained a foothold."

(c) Sky News 2026: Websites across Europe go offline after warning issued for critical software update