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.
9.1
93.9%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Published
- May 13, 2026
- Modified
- Jun 17, 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
Affected packages
Proof-of-concept & exploitation references
8 foundWeaponization
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.
- sfewer-r7/CVE-2026-0257★ 30
Proof-of-concept script to leverage the PAN-OS GlobalProtect authentication bypass CVE-2026-0257
updated Sep 30, 2026
- 0xBlackash/CVE-2026-0257★ 3
CVE-2026-0257
updated Jun 15, 2026
- tushargurav28/CVE-2026-0257★ 3
Palo Alto Networks PAN-OS contains an authentication bypass caused by flaws in the GlobalProtect portal and gateway, letting attackers establish unauthorized VPN connections, exploit requires network access to the portal or gateway.
updated Jun 15, 2026
- grayxploit/CVE-2026-0257★ 2
GrayXploit Security research and defensive team validate this toolkit for CVE-2026-0257 (PAN-OS GlobalProtect Authentication Bypass). Includes vulnerability assessment, detection guidance, technical analysis, indicators of compromise (IOCs), and remediation validation resources for security teams and defenders.
updated Oct 13, 2026
- akashsingh0454/CVE-2026-0257-PoC★ 2
updated Jun 3, 2026
- Mr-Robot-LP/CVE-2026-0257★ 1
Exploits the CVE-2026-0257 vulnerability by forging a GlobalProtect authentication override cookie using the TLS server's public key.
updated Jun 1, 2026
- HORKimhab/CVE-2026-0257★ 0
CVE-2026-0257 - PAN-OS
updated May 31, 2026
- Ez4rd1x1/CVE-2026-0257★ 0
testing
updated Jun 15, 2026
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 9.1 out of 10 (CVSS 3.1).
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?
93.9% - meaning FIRST.org's EPSS model estimates a 93.9% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-0257?
We found 8 public GitHub repositories referencing CVE-2026-0257, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
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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