UPDATE — CVE-2026-0300 (PAN-OS Captive Portal unauthenticated root RCE): CISA KEV deadline is **today (2026-05-09)**; no patch until 2026-05-13

(First covered and deep-dived 2026-05-07.) The CISA KEV federal remediation deadline for CVE-2026-0300 is 2026-05-09 — today. Palo Alto Networks has not released a permanent patch for any PAN-OS branch; the earliest patch ETA is 2026-05-13. The mandated mitigation remains: disable the Captive Portal / Authentication Portal feature on internet-facing GlobalProtect gateway interfaces, or restrict access exclusively to trusted internal management IP ranges. PAN-OS 11.1+ deployments should confirm Threat Prevention profile with Threat ID 510019 is active on the internet-facing zone. Organisations that have not yet applied the mitigation should treat this as a P0 action today before business opens.