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[ CVE-2026-0257 · Published 13 May 2026 ]

Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Exploited · CISA KEV CVSS 9.1 EPSS 97%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-05-29
  • Known to be used in ransomware campaigns
  • EPSS: 97% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 9.1

[ Description ]Official description

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.

CISA: Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 1 Jun 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References