PAN-OS
CVE-2026-0279: Multiple Cross-Site Scripting (XSS) Vulnerabilities
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cloud NGFW | Not affected |
| PAN-OS 12.1 | 12.1.8 or later |
| PAN-OS 11.2 | 11.2.13 or later |
| PAN-OS 11.1 | 11.1.16 or later |
| PAN-OS 10.2 | See the advisory |
| Prisma Access 12.1 | 12.1.8 or later |
| Prisma Access 11.2 | See the advisory |
| Prisma Access 10.2 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Am I affected?
No special configuration is required to be affected by this issue.
Workarounds
The vast majority of firewalls already follow Palo Alto Networks' and industry best practices. However, if you have not already, we strongly recommend that you secure access to your management interface according to our 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). Specifically, you should restrict management interface access to only trusted internal IP addresses.
Review information about how to secure management access to your Palo Alto Networks firewalls:
https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 * https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431Palo Alto Networks LIVEcommunity article (https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431) * Palo Alto Networks official and detailed technical documentation (https://docs.paloaltonetworks.com/best-practices/10-1/administrative-access-best-practices/administrative-access-best-practices/deploy-administrative-access-best-practices)
Exploitation
Palo Alto Networks is not aware of any malicious exploitation of these issues.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 10 Oct 2026.