PAN-OS Stored XSS via Web Interface on PA-Series/VM-Series & Panorama
CVE-2026-0256 Published on May 13, 2026
PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
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.
Vulnerability Analysis
CVE-2026-0256 is exploitable with network access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Timeline
Initial publication.
Weakness Type
What is a XSS Vulnerability?
The software 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.
CVE-2026-0256 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-0256
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Affected Versions
Palo Alto Networks Cloud NGFW:- Version All is unaffected.
- Version 12.1.0 and below 12.1.7 is affected.
- Version 11.2.0 and below 11.2.12 is affected.
- Version 11.1.0 and below 11.1.15 is affected.
- Version 10.2.0 and below 10.2.18-h6 is affected.
- Version All is unaffected.
- Before * is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.