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.CreditsKrzysztof Zając (CERT PL)WPScanReferenceshttps://wpscan.com/vulnerability/55d23184-fc5a-4090-b079-142407b59b05
