Stored Cross-Site Scripting Vulnerability in Palo Alto Networks PAN-OS Software
CVE-2026-0256

4.4MEDIUM

Key Information:

Vendor

Palo Alto Networks
Status
Cloud Ngfw
Pan-os
Prisma Access
Vendor
CVE Published:
13 May 2026

Badges

👾 Exploit Exists

What is CVE-2026-0256?

A stored cross-site scripting vulnerability exists in Palo Alto Networks PAN-OS software, allowing authenticated administrators to exploit the web interface. By storing malicious JavaScript payloads, an attacker can execute scripts that affect users or manipulate data. This affects PAN-OS running on PA-Series, VM-Series firewalls, and Panorama solutions, posing a potential risk to network security. Notably, Cloud NGFW and Prisma Access are not vulnerable to this issue.

Affected Version(s)

PAN-OS 12.1.0 < 12.1.7

PAN-OS 11.2.0 < 11.2.12

PAN-OS 11.1.0 < 11.1.15

References

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

CVSS V4

Score:
4.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

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