Critical Palo Alto VPN bug now exploited by Qilin ransomware gang post, juli 21, 2026juli 22, 2026 The Qilin ransomware gang is exploiting a critical PAN-OS GlobalProtect authentication bypass flaw to breach victims’ networks, according to cybersecurity company Arctic Wolf. Palo Alto Networks addressed the vulnerability (CVE-2026-0257) on May 13 and warned that attackers had begun abusing it to breach corporate networks after Rapid7 reported observing it being exploited against numerous customers starting on May 17. Critical Palo Alto VPN bug now exploited by Qilin ransomware gang: Critical Palo Alto VPN bug now exploited by Qilin ransomware gang ransomware vulnerability 2026