Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Palo Alto Networks — Cloud NGFW
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.
7.8
86.7%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (Vulnerable System)
- Low
- Integrity (Vulnerable System)
- None
- Availability (Vulnerable System)
- None
- Confidentiality (Subsequent System)
- High
- Integrity (Subsequent System)
- High
- Availability (Subsequent System)
- None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red
- Published
- May 13, 2026
- Modified
- Jul 14, 2026
- Added to KEV
- May 29, 2026
- Federal patch due
- Jun 1, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2026-0257, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2026-0257 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
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.
How severe is CVE-2026-0257?
CVE-2026-0257 has a CVSS base score of 7.8 out of 10 (CVSS 4.0).
Is CVE-2026-0257 actively exploited in the wild?
Yes. CVE-2026-0257 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added May 29, 2026, meaning CISA has confirmed evidence of active exploitation. It is also flagged as used in ransomware campaigns.
What is the EPSS score for CVE-2026-0257?
86.7% - meaning FIRST.org's EPSS model estimates a 86.7% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
What type of vulnerability is CVE-2026-0257?
CVE-2026-0257 is classified under CWE-565 (CWE-565 Reliance on Cookies without Validation and Integrity Checking).
Cross-checked against
Impactr finds and proves whether CVE-2026-0257 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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