Palo Alto Captive Portal/Clientless VPN/GlobalProtect cross site scripting

Summaryinfo

A vulnerability was found in Palo Alto Captive Portal, Clientless VPN and GlobalProtect and classified as problematic. Affected by this issue is some unknown functionality. Executing a manipulation can lead to cross site scripting. This vulnerability is registered as CVE-2026-0279. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in Palo Alto Captive Portal, Clientless VPN and GlobalProtect (the affected version is unknown). This vulnerability affects an unknown code. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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 advisory is available at security.paloaltonetworks.com. This vulnerability was named CVE-2026-0279 since 11/03/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-42682) and CERT Bund (WID-SEC-2026-2261). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Palo Alto Networks PAN-OS

Productinfo

Type

• Network Encryption Software

Vendor

• Palo Alto

Name

• Captive Portal
• Clientless VPN
• GlobalProtect

License

• commercial

Website

• Vendor: https://www.paloaltonetworks.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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