Palo Alto, Cisco, and Ivanti each disclosed an actively exploited zero-day within 48 hours, but the Ivanti case, three chained flaws with only two patched, is the one that shows single-CVE patching no longer closes the door.
CVE-2026-0300 (CVSS 9.3) is an unauthenticated, root-level RCE in the PAN-OS User-ID Authentication Portal of PA-Series and VM-Series firewalls, under active exploitation by a likely China-aligned cluster Unit 42 tracks as CL-STA-1132. First hotfixes ship May 13. Anything with the Captive Portal exposed to untrusted networks needs immediate mitigation.
ShinyHunters expanded Monday's identity breach wave to 275 million education users via Canvas and pivoted to cloud data warehouse infrastructure at Vimeo; separately, an unpatched PAN-OS RCE zero-day leaves internet-facing firewalls exposed until at least May 13.
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