What is CVE-2026-0257?
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.
Timeline
- 2026-05-13Published to the U.S. National Vulnerability Database (NVD)
- 2026-05-29Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-05-31First covered in a defend.network daily briefing
- 2026-06-01CISA federal remediation deadline (BOD 22-01)
- 2026-06-17NVD record last updated
CISA Known Exploited Vulnerability
Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Affected product
Palo Alto Networks PAN-OS
NVD also lists CPE entries for: Paloaltonetworks Pan-Os, Paloaltonetworks Prisma Access, Siemens Ruggedcom Ape1808 Firmware, Siemens Ruggedcom Ape1808
Remediation Steps
- Apply the latest PAN-OS security patch to all affected appliances
- Verify GlobalProtect portal and gateway authentication mechanisms post-patch
- Review VPN access logs for signs of unauthorized authentication bypass exploitation
- Monitor for suspicious lateral movement and ransomware deployment indicators
- Implement additional authentication controls (multi-factor authentication) where available
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
- https://nvd.nist.gov/vuln/detail/CVE-2026-0257
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 3 of July 2026 (July 20 – 26)
- Vulnerability Priority Report – Week 4 of June 2026 (June 22 – 28)
- Vulnerability Priority Report – Week 3 of June 2026 (June 15 – 21)
- Vulnerability Priority Report – Week 2 of June 2026 (June 8 – 14)
- Vulnerability Priority Report – Week 1 of June 2026 (June 1 – 7)
- PAN-OS GlobalProtect actively exploited; Russian infrastructure dismantled; Linux kernel flaw (2026-06-01)
- Active exploits: Palo Alto GlobalProtect, CISA credential leak, Linux kernel RCE (2026-05-31)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.