CVE-2026-0279: Palo Alto Networks PAN-OS

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Multiple cross site scripting vulnerabilities in the User-ID™ Authentication Portal (aka Captive Portal) service, GlobalProtect™ gateway/portal features and Clientless VPN of Palo Alto Networks PAN-OS® software enables a malicious unauthenticated user to store or execute malicious JavaScript payload. The security risk posed by this issue is minimized when the management interface and access to the User-ID™ Authentication Portal is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . This issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama (virtual and M-Series). Cloud NGFW is not affected by this vulnerability.

Affected products

• Palo Alto Networks PAN-OS: from 10.2.0, before 11.1.16 (fixed in 11.1.16); from 11.2.0, before 11.2.13 (fixed in 11.2.13); from 12.1.0, before 12.1.8 (fixed in 12.1.8)

Published 2026-07-09. Last modified 2026-08-11.