Cross-site scripting in Palo Alto PAN-OS - CVE-2026-0256
Published: May 19, 2026
Vulnerability identifier: #VU131777
CSH Severity: Low
CVSS v4: 4.8 [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]
CVE-ID: CVE-2026-0256
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Palo Alto PAN-OS
How to mitigate CVE-2026-0256
Install security update from vendor's website.
Palo Alto PAN-OS - addressed in versions 10.2.7-h34, 10.2.10-h36, 10.2.13-h21, 10.2.16-h7, 10.2.18-h6, 11.1.4-h33, 11.1.6-h32, 11.1.7-h6, 11.1.10-h25, 11.1.13-h5, 11.1.15, 11.2.4-h17, 11.2.7-h13, 11.2.10-h6, 11.2.12, 12.1.4-h5, 12.1.7