Cross-site scripting in Palo Alto PAN-OS - CVE-2026-0256

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Main Vulnerability Database Vulnerabilities #VU131777

Cross-site scripting in Palo Alto PAN-OS - CVE-2026-0256

Published: May 19, 2026


Vulnerability identifier: #VU131777
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-0256
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Palo Alto Networks, Inc.
Affected software:
Palo Alto PAN-OS

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary script in a victim's browser.

The vulnerability exists due to cross-site scripting in the web interface when processing stored administrator-supplied input. A remote privileged user can store a malicious JavaScript payload to execute arbitrary script in a victim's browser.

User interaction is required for the crafted content to be viewed.


How to mitigate CVE-2026-0256

Install security update from vendor's website.

Sources