Damir Mujezinovic writes: “As by far the most popular content management system, WordPress powers millions of different websites. It’s open source software, which means its source code is publicly accessible and can be modified by pretty much anyone with sufficient know-how. In February 2022, Jetpack discovered that popular themes and plugins from the vendor AccessPress Themes (also known as Access Keys) were compromised. The researchers spotted the vulnerability by accident, after discovering suspicious code on a compromised website. Upon further investigation, they realized most AccessPress plugins and every theme contained the same code.”