Urgent: PAN-OS GlobalProtect Authentication Bypass Vulnerability (CVE-2026-0257) Exploited in the Wild
In May 2026, Palo Alto Networks disclosed an authentication bypass vulnerability (CVE-2026-0257) in its PAN-OS software, affecting GlobalProtect portals and gateways. This flaw allows unauthenticated attackers to establish unauthorized VPN connections, potentially exposing internal networks. The vulnerability impacts specific PAN-OS versions and configurations where authentication override cookies are enabled. Exploitation was observed as early as May 17, 2026, with attackers gaining VPN access to internal networks. While no lateral movement was detected, the unauthorized access poses significant security risks. Organizations are urged to apply patches or mitigations promptly to prevent potential breaches.
Kill Chain