Palo Alto Warns of Active Exploitation of PAN-OS GlobalProtect VPN Flaw
Jun 15, 2026
Vulnerability / VPN Security
Palo Alto Networks has revealed that it has observed "active exploitation" of a recently disclosed PAN-OS vulnerability by an unknown threat actor to obtain unauthorized access to GlobalProtect portals. The vulnerability in question is CVE-2026-0257 (CVSS score: 7.8), an authentication bypass flaw affecting the portal and gateway components of PAN-OS software that could be exploited by bad actors to set up VPN connections. According to the network security company, the security defect could be exploited by a bad actor to bypass security controls and initiate VPN connections. The vulnerability has been exploited in the wild in limited attacks, with initial activity observed on May 17, 2026. It's currently unknown who is behind the exploitation efforts. "No post-access behavior or lateral movement has been identified as of this time," Palo Alto Networks said . "Only a small portion of the probed devices actually established VPN sessions, resulting ...
