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CVE-2026-0257: Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-05-29
• EPSS: 95.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-565

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.

Affected products

• Palo Alto Networks PAN-OS: before 10.2.7; 10.2.7, 10.2.7-h1, 10.2.7-h12, 10.2.7-h16, 10.2.7-h18, 10.2.7-h19 (+153) — fixed in 10.2.7
• Palo Alto Networks Prisma Access: all versions
• Siemens Ruggedcom Ape1808 Firmware: all versions

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 10.2.7. Check the vendor advisory for mitigations.

In the news

• Active Exploitation of May 2026 PAN-OS CVE-2026-0257 (Updated October 20)

References

• https://security.paloaltonetworks.com/CVE-2026-0257
• https://cert-portal.siemens.com/productcert/html/ssa-967325.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257

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