School Management Wordpress Plugin
The issue is related to an obfuscated backdoor injected in the license checking code of the School Management WordPress plugin, which registers a REST API handler. This allows an unauthenticated attacker to execute arbitrary PHP code on the site, potentially leading to full control over the application. The estimated number of potentially affected devices worldwide is over 340,000, as the plugin's creator, Weblizar, claims to have more than 340,000 clients using its premium and free WordPress themes and plugins. The vulnerability was discovered in the premium versions of the plugin prior to 9.9.7 and is considered highly severe.