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CVE-2026-0308: PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface

• Severity: low (CVSS 1.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-10-15
• Weakness: CWE-79

Description

A stored cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious authenticated administrator to store or execute 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 12.1.0 before 12.1.10; from 11.2.0 before 11.2.13-h2; from 11.1.0 before 11.1.16-h2 — fixed in 11.1.16-h2, 11.2.13-h2, 12.1.10
• Palo Alto Networks Prisma Access: all versions

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 11.1.16-h2, 11.2.13-h2, 12.1.10. Check the vendor advisory for mitigations.

In the news

• CVE-2026-0308 PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface (Severity: LOW)

References

• https://security.paloaltonetworks.com/CVE-2026-0308
• https://cert-portal.siemens.com/productcert/html/ssa-104023.html

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