Description
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.
The risk is highest when you allow access to the management interface from external IP addresses on the internet.
You can reduce the risk of exploitation by restricting access to a jump box that is the only system allowed to access the management interface.
The risk of exploitation is lower for Prisma Access as it requires an authenticated user and the external network access to the management interface is restricted.
Problem types
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Product status
All (custom)
12.1.0 (custom) before 12.1.8
11.2.0 (custom) before 11.2.13
11.1.0 (custom) before 11.1.16
10.2.0 (custom) before 10.2.18-h8
12.1.0 (custom) before 12.1.8
11.2.0 (custom)
10.2.0 (custom)
Timeline
| 2026-07-08: | Updated the Unaffected version for Prisma Access. |
| 2026-07-08: | Initial publication |
Credits
our internal security research teams
References
security.paloaltonetworks.com/CVE-2026-0279