21 October 2026, Baden-Württemberg, Stuttgart: When visiting the website of the Baden-Württemberg Ministry of the Interior, a warning message appears in the browser indicating a potential security issue. A serious security vulnerability is threatening websites worldwide; blogs, online stores, and news portals could become targets for attackers. The PHP vulnerability allows attackers to take over entire servers. Photo: Bernd Weißbrod/dpa (Photo by Bernd Weißbrod/picture alliance via Getty Images)

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The tech world is racing to implement fixes after the discovery of critical security vulnerabilities in software used to power much of the internet.

The software, known as PHP, is an open-source programming language widely used to power websites and web applications.…