CVE-2026-0256 PUBLISHED

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

Assigner: palo_alto
Reserved: 03.11.2025 Published: 13.05.2026 Updated: 13.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber
CVSS Score: 4.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	High
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Palo Alto Networks
Product	Cloud NGFW
Versions	Default: unaffected Version All is unaffected

Vendor	Palo Alto Networks
Product	PAN-OS
Versions	Default: unaffected affected from 12.1.0 to 12.1.7 (excl.) affected from 11.2.0 to 11.2.12 (excl.) affected from 11.1.0 to 11.1.15 (excl.) affected from 10.2.0 to 10.2.18-h6 (excl.)

Vendor	Palo Alto Networks
Product	Prisma Access
Versions	Default: unaffected Version All is unaffected

Exploits

Palo Alto Networks is not aware of any malicious exploitation of this issue.

Credits

Palo Alto Networks thanks our internal security research teams for discovering and reporting this issue. finder

References

https://security.paloaltonetworks.com/CVE-2026-0256

Problem Types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE

Impacts

CAPEC-592 Stored XSS