CVE-2026-0257

CRITICAL

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.

CVSS v3.1 Score

9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Published: 5/13/2026Modified: 5/29/2026

Related Intelligence (4)

MEDIUMVulnerability

Palo Alto GlobalProtect VPN auth bypass flaw now exploited in attacks

Palo Alto Networks is warning that hackers are now exploiting a PAN-OS GlobalProtect authentication bypass flaw, tracked as CVE-2026-0257, in attacks attempting to breach corporate networks. [...]

CVE-2026-0257
BleepingComputer
HIGHVulnerability

PAN-OS GlobalProtect Authentication Bypass (CVE-2026-0257) Under Active Exploitation

Palo Alto Networks has warned that a recently disclosed medium-severity security flaw impacting PAN-OS and Prisma Access has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-0257 (CVSS score: 7.8), refers to a case of authentication bypass that could be exploited by bad actors to set up VPN connections. "Authentication bypass vulnerabilities in the

CVE-2026-0257
The Hacker News
CRITICALVulnerability

Rapid7 Observed Exploitation of PAN-OS GlobalProtect Authentication Bypass Vulnerability (CVE-2026-0257)

Overview On May 13, 2026, Palo Alto Networks published a security advisory for CVE-2026-0257, a medium severity authentication bypass affecting PAN-OS and Prisma Access when a specific configuration is present. Successful exploitation of this vulnerability allows a remote unauthenticated attacker to successfully establish a VPN connection through the GlobalProtect gateway of an affected appliance.

CVE-2026-0257
Rapid7
HIGHVulnerability

CISA KEV: Palo Alto Networks PAN-OS — Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.

CVE-2026-0257Palo Alto Networks PAN-OS
CISA KEV

References (2)

https://security.paloaltonetworks.com/CVE-2026-0257Vendor Advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257