Medium6.9Palo Alto Networks

Medium [CVE-2026-0256] PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface

This medium-severity Palo Alto Networks advisory covers CVE-2026-0256 affecting PAN-OS.

CVE-2026-0256 Published May 28, 2026

CVE-2026-0256

Affected products & platforms

Palo Alto NetworksPAN-OSFirewallPAN-OS / Panorama

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Summary

CVE-2026-0256 PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface

Affected versions

PAN-OS < 12.1.7
PAN-OS < 11.2.12
PAN-OS < 11.1.15
PAN-OS < 10.2.18-h6

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

PAN-OS >= 12.1.7
PAN-OS >= 12.1.4-h5
PAN-OS >= 11.2.12
PAN-OS >= 11.2.10-h6
PAN-OS >= 11.2.7-h13
PAN-OS >= 11.2.4-h17
PAN-OS >= 11.1.15
PAN-OS >= 11.1.13-h5
PAN-OS >= 11.1.10-h25
PAN-OS >= 11.1.7-h6
PAN-OS >= 11.1.6-h32
PAN-OS >= 11.1.4-h33
PAN-OS >= 10.2.18-h6
PAN-OS >= 10.2.16-h7
PAN-OS >= 10.2.13-h21
PAN-OS >= 10.2.10-h36
PAN-OS >= 10.2.7-h34

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Upgrade to a fixed release: PAN-OS >= 12.1.7; PAN-OS >= 12.1.4-h5; PAN-OS >= 11.2.12; PAN-OS >= 11.2.10-h6; ….

Temporary workarounds

Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510020 (from Applications and Threats content version 9100-10044 and later).
For these Threat IDs to protect against attacks for this vulnerability:

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Palo Alto Networks Security Advisoriesofficial
Official vendor feed — the source of truth for this advisory. VulnPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://security.paloaltonetworks.com/rss.xml; this link opens the Palo Alto Networks advisory index instead of the raw feed document.
Palo Alto Networks
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Palo Alto Networks
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-0256NVD CVE.org MITRE

Official resources

PAN-OS / Panorama upgrade guide (target: 12.1.7 / 12.1.4-h5 / 11.2.12)
Official documentation
This advisory names 12.1.7 / 12.1.4-h5 / 11.2.12 as the first fixed releases — official upgrade documentation for PAN-OS firewalls and Panorama.
Palo Alto Networks Security Advisories portal
Official documentation
Canonical advisory portal — check here for the latest revision of this advisory and affected-version updates.

Discussion(0)

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