PALO ALTO Security Advisory
Published Date: May 6, 2026
CVE: CVE-2026-0300
Advisory Summary
🔴 CRITICAL ALERT: PAN-OS User-ID™ Authentication Portal Vulnerability (CVE-2026-0300)
Palo Alto Networks has disclosed a critical security vulnerability identified as CVE-2026-0300, affecting the PAN-OS User-IDâ„¢ Authentication Portal. This is a buffer overflow flaw exploitable by unauthenticated users, potentially allowing attackers to execute arbitrary code or crash the authentication service. Given the severity marked as critical, it poses a significant risk to network security infrastructure relying on PAN-OS for user identification and access control.
IT security professionals and infrastructure managers are strongly advised to review their PAN-OS versions and apply the vendor-provided patches immediately to mitigate this vulnerability. Delay in patching could lead to exploitation that impacts service availability and compromises internal network security.
Stay vigilant and coordinate with your security teams to implement necessary safeguards against this vulnerability.
Reference: Vendor Advisory