CVE-2026-0257

Critical9.1Published on May 13, 2026

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.

Actively exploited

In the CISA exploited-vulnerabilities catalogue since May 29, 2026
US federal agencies must remediate it by Jun 1, 2026 (BOD 22-01)
First attack observed 15 days after disclosure
Used in ransomware campaigns

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Source: CISA KEV · Aug 7, 2026 Jul 27, 2026 Jul 20, 2026 Jul 9, 2026 Jun 24, 2026 Jun 11, 2026

CVSS score9.1 / 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness type (CWE)CWE-565

Vendorssiemens, paloaltonetworks