WordPress plugins that enhance user experience often expose administrative configuration fields that directly influence frontend rendering. When these fields are not properly sanitized, they can become a serious attack surface. CVE-2026-2687 affects the Reading Progressbar plugin, a lightweight tool that displays a reading progress indicator using an HTML5
A stored Cross-Site Scripting (XSS) vulnerability was identified in the plugin’s settings panel, allowing an attacker to inject malicious JavaScript that is permanently stored and later executed in visitors’ or administrators’ browsers. This flaw can be leveraged to compromise administrator sessions, inject backdoors, or fully take over affected WordPress sites.

