Qilin Ransomware Attackers Exploit PAN-OS Authentication Bypass for Initial Access

Qilin ransomware operators are exploiting CVE-2026-0257, a high-severity Palo Alto Networks PAN-OS authentication bypass, to gain initial access to victim networks and deploy encryption payloads. Arctic Wolf Labs documented multiple intrusions in June 2026 using the flaw to sidestep VPN authentication when specific certificate configurations are present.

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