CVE-2023-5560 – WP-UserOnline < 2.88.3 - Unauthenticated Stored XSS

https://notcve.org/view.php?id=CVE-2023-5560

The WP-UserOnline WordPress plugin before 2.88.3 does not sanitise and escape the X-Forwarded-For header before outputting its content on the page, which allows unauthenticated users to perform Cross-Site Scripting attacks. El complemento WP-UserOnline de WordPress anterior a 2.88.3 no sanitiza ni escapa del encabezado X-Forwarded-For antes de mostrar su contenido en la página, lo que permite a usuarios no autenticados realizar ataques de Cross Site Scripting. The WP-UserOnline plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'X-Forwarded-For' header in all versions up to, and including, 2.88.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. • https://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05 • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •