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
- 95.01% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- 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
EPSS moved from 96.9% on 24 September 2026 to 95.0% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.