CVE-2026-0257
Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 1 June 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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 4.0
- 7.8 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 95.16% probability · 100th percentile
- CISA KEV
- Listed 29 May 2026 · due 1 June 2026 · used in ransomware campaigns
- Weakness
- CWE-565
- Affected
- paloaltonetworks/pan-os · paloaltonetworks/prisma access · siemens/ruggedcom ape1808 firmware
- Source
- psirt@paloaltonetworks.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://security.paloaltonetworks.com/CVE-2026-0257 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0257
References
- https://security.paloaltonetworks.com/CVE-2026-0257Vendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-967325.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0257US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.