The Real Cookie Banner plugin is a powerful consent management tool for WordPress, widely used to help website administrators comply with the GDPR and ePrivacy directives. With features like customizable cookie banners, content blockers, and consent documentation, the plugin plays a key role in user privacy and legal compliance. However, in version below 5.1.6, a Stored Cross-Site Scripting (XSS) vulnerability was discovered that can be exploited by authenticated users with access to the plugin’s customization features.
This article explores the vulnerability in detail, demonstrates how it can be exploited, and outlines practical recommendations for mitigating similar security risks in WordPress environments.