Malicious hackers have compromised potentially thousands of organizations by exploiting two new zero-day vulnerabilities found in widely used software made by cybersecurity giant Palo Alto Networks. Security researchers at Palo Alto Networks said Wednesday that they have observed a “limited set of exploitation activity” related to the two vulnerabilities in PAN-OS, the operating system that runs on all of Palo Alto’s next-generation firewalls. The bugs are considered zero-days because the compan...