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

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-10 · updated 2026-10-15
Weakness: CWE-79

Description

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 products

Palo Alto Networks PAN-OS: from 10.2.0 before 11.1.14; from 11.2.0 before 11.2.11; from 12.1.0 before 12.1.5 — fixed in 11.1.14, 11.2.11, 12.1.5
Palo Alto Networks PAN-OS: from 12.1.0 before 12.1.5; from 11.2.0 before 11.2.11; from 11.1.0 before 11.1.14; 10.2.0 — fixed in 12.1.5, 11.2.11, 11.1.14

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 11.1.14, 11.2.11, 12.1.5; Palo Alto Networks PAN-OS 12.1.5, 11.2.11, 11.1.14. Check the vendor advisory for mitigations.

References

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