PAN-OS GlobalProtect flaw exploited in wild
An authentication bypass in PAN-OS GlobalProtect (CVE-2026-0257) is under active exploitation and has been added to CISA's KEV catalog.
Sourcecisecurity.org — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-0257 as exploited in the wild.
Palo Alto Networks has disclosed an authentication bypass vulnerability affecting the GlobalProtect portal and gateway components of PAN-OS. The flaw allows an attacker to bypass security restrictions and establish an unauthorized VPN connection on firewalls where authentication override cookies are enabled alongside a specific certificate configuration. This impacts multiple PAN-OS 10.2, 11.1, and 11.2 branches as well as Prisma Access deployments.
Palo Alto Networks confirmed limited exploit attempts against unpatched, unmitigated devices, and CISA has added CVE-2026-0257 to its Known Exploited Vulnerabilities catalog based on evidence of active exploitation. Because GlobalProtect serves as the central control plane for VPN access, successful exploitation could allow attackers to bypass authentication, establish unauthorized remote access, and subsequently conduct reconnaissance, lateral movement, or data exfiltration within victim networks.
Organizations running affected PAN-OS or Prisma Access versions should prioritize patching immediately given confirmed in-the-wild exploitation. MS-ISAC recommends standard vulnerability management practices including timely patch deployment, network segmentation, and monitoring for anomalous VPN authentication activity as interim mitigations for systems that cannot be immediately updated.
Mentioned in this report
Source reporting: https://www.cisecurity.org/advisory/a-vulnerability-in-pan-os-could-allow-for-authentication-bypass_2026-062
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