PALO ALTO Security Advisory
Published Date: May 13, 2026
CVE: CVE-2026-0300
Advisory Summary
❗ Critical Security Alert: PAN-OS Buffer Overflow Vulnerability in User-ID™ Authentication Portal
Palo Alto Networks has disclosed a critical unauthenticated buffer overflow vulnerability (CVE-2026-0300) affecting the PAN-OS User-ID™ Authentication Portal. This flaw allows an unauthenticated attacker to exploit the portal, leading to potential arbitrary code execution or system compromise. Given the portal’s role in user authentication and visibility, exploitation could severely impact network security integrity and access control.
▶️ Immediate action is strongly advised: organizations deploying PAN-OS should prioritize applying the provided security patches to mitigate the risk. Failure to do so could result in unauthorized access and potential disruption of firewall security policies.
Stay vigilant by monitoring the official Palo Alto security advisories and integrate this patch promptly into your security maintenance cycles.
Reference: Vendor Advisory