A cross-site scripting (XSS) vulnerability exists when visiting malicious websites with the Palo Alto Networks GlobalProtect Clientless VPN that can compromise the user's active session. This issue affects: PAN-OS 7.1 versions earlier than 7.1.26; PAN-OS 8.1 versions earlier than 8.1.13; PAN-OS 9.0 versions earlier than 9.0.7; All versions of PAN-OS 8.0.