Palo Alto Cloud NGFW/PAN-OS/Prisma Access Web Interface cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access. The affected element is an unknown function of the component Web Interface. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-0256. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Palo Alto Cloud NGFW, PAN-OS and Prisma Access (version now known) and classified as problematic. This issue affects some unknown processing of the component Web Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

A stored cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store a JavaScript payload using the web interface. This issue is applicable to PAN-OS software on PA-Series and VM-Series firewalls and on Panorama (virtual and M-Series). Cloud NGFW and Prisma® Access are not impacted by this vulnerability.

The advisory is shared at security.paloaltonetworks.com. The identification of this vulnerability is CVE-2026-0256 since 11/03/2025. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

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 vulnerability database at EUVD (EUVD-2026-30103). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Vendor

• Palo Alto

Name

• Cloud NGFW
• PAN-OS
• Prisma Access

License

• commercial

Website

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

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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