What is PHP and why did it take government websites offline?

On Wednesday, government websites throughout Europe experienced significant disruptions as IT teams worked urgently to address two critical vulnerabilities in PHP, a programming language ubiquitous across the internet. The creators of PHP announced on the same day that patches for these severe flaws would be made available. European cybersecurity authorities advised entities unable to implement the corrective measures to take their websites offline temporarily.

PHP, short for PHP: Hypertext Preprocessor, is a programming language responsible for powering a substantial portion of websites worldwide. It operates covertly in the background, assembling web content and transmitting the fully formed page to a user's browser upon request. This language is not only free and open-source but is also maintained by a network of volunteers. Website administrators typically do not interact directly with PHP; it functions as a silent, underlying engine.

PHP's influence is immense, accounting for approximately 70 percent of all websites whose programming language can be identified, according to web technology analysis firm W3Techs. It serves as the backbone for platforms like WordPress, which governs around 40 percent of online entities, including blogs, small business pages, government portals, e-commerce sites, and news portals.

The vulnerabilities identified pose significant risks. The two flaws could allow malicious actors to execute arbitrary code, leading to server compromise and potential data breaches. The urgency of the situation prompted EU cybersecurity agencies to urge organizations lacking the capability to apply the necessary patches to take affected websites offline as a precautionary measure.