CVE-2026-0266: PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface (Severity: LOW)

Published Jun 10, 2026
·
Updated

A 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 affected by this vulnerability.

Affected Software

9 affected componentsFixes available
Palo Alto Networks PAN-OS (PA-Series)
Palo Alto Networks PAN-OS (VM-Series)
Palo Alto Networks PAN-OS (Panorama virtual and M-Series)
Palo Alto Networks Cloud NGFW
Palo Alto Networks PAN-OS<12.1.5, =12.1.0, <11.2.11, =11.2.0, <11.1.14, =11.1.0, =10.2.0
12.1.511.2.1111.1.14
Palo Alto Networks Prisma Access
Palo Alto Networks PAN-OS>=10.2.0<11.1.14
Palo Alto Networks PAN-OS>=11.2.0<11.2.11
Palo Alto Networks PAN-OS>=12.1.0<12.1.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 12.1.5Fixed in 11.2.11Fixed in 11.1.14
  2. Upgrade

    Upgrade Palo Alto Networks PAN-OS to a version that resolves this vulnerability.

    Fixed in 11.1.14
  3. Upgrade

    Upgrade Palo Alto Networks PAN-OS to a version that resolves this vulnerability.

    Fixed in 11.2.11
  4. Upgrade

    Upgrade Palo Alto Networks PAN-OS to a version that resolves this vulnerability.

    Fixed in 12.1.5

Event History

Jun 10, 2026
Advisory Published
via Palo Alto Networks·04:00 PM
Data Sourced
via Palo Alto Networks·04:00 PM
RemedyDescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·08:30 PM
Data Sourced
via MITRE·08:30 PM
DescriptionWeakness
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-0266?

The severity of CVE-2026-0266 is classified as medium with a CVSS score of 4.8.

2

How do I fix CVE-2026-0266?

To fix CVE-2026-0266, upgrade to the recommended versions of PAN-OS based on your current version.

3

What types of firewalls are affected by CVE-2026-0266?

CVE-2026-0266 affects PAN-OS software running on PA-Series and VM-Series firewalls and on Panorama.

4

What kind of vulnerability is CVE-2026-0266?

CVE-2026-0266 is a stored cross-site scripting (XSS) vulnerability.

5

Is there a workaround for CVE-2026-0266?

There are currently no known workarounds or mitigations for CVE-2026-0266.

Company

Resources

Contact

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