Cybercriminals are actively exploiting a recently discovered vulnerability in Palo Alto Networks firewall and VPN appliances to deploy the Qilin ransomware strain.
A critical authentication bypass flaw (CVE-2026-0257) in Palo Alto GlobalProtect portal and gateway was the common link in a series of intrusions in June, Arctic Wolf Labs warns. Exploitation of the vulnerability came within days of disclosure.
“Post-exploitation tradecraft varied across intrusions, from rapid encryption-only operations to full double-extortion, possibly suggesting multiple affiliates operating under the Qilin ransomware-as-a-service (RaaS) umbrella,” Arctic Wolf’s researchers wrote in a post on the threat.
The ca...