CVE-2026-0266: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Palo Alto Networks Cloud NGFW
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.
AI Analysis
Technical Summary
This vulnerability involves improper neutralization of input during web page generation (CWE-79) in Palo Alto Networks PAN-OS software. An authenticated administrator can inject and store malicious JavaScript code through the web interface, potentially leading to XSS attacks. The issue affects physical and virtual firewall appliances (PA-Series, VM-Series) and Panorama management devices but does not impact the Cloud NGFW or Prisma Access services. The CVSS 4.0 base score is 1.1, indicating low severity. There is no vendor advisory or patch information available at this time.
Potential Impact
An authenticated administrator could store malicious JavaScript code in the web interface, which might be executed in the context of other administrators' browsers. The impact is limited by the requirement for authenticated access and the low CVSS score. There is no indication of remote unauthenticated exploitation or system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict administrative access to trusted personnel only and monitor for unusual administrative activity. No official fix or temporary workaround has been published by the vendor.
CVE-2026-0266: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Palo Alto Networks Cloud NGFW
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.
CVSS v4.0
Score 1.1low
Affected software
cpe:2.3:o:palo_alto_networks:pan-os:12.1.4:*:*:*:*:*:*:*cpe:2.3:o:palo_alto_networks:pan-os:12.1.3:*:*:*:*:*:*:*cpe:2.3:o:palo_alto_networks:pan-os:12.1.2:*:*:*:*:*:*:*cpe:2.3:o:palo_alto_networks:pan-os:11.2.10:*:*:*:*:*:*:*cpe:2.3:o:palo_alto_networks:pan-os:11.2.9:*:*:*:*:*:*:*cpe:2.3:o:palo_alto_networks:pan-os:11.2.8:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper neutralization of input during web page generation (CWE-79) in Palo Alto Networks PAN-OS software. An authenticated administrator can inject and store malicious JavaScript code through the web interface, potentially leading to XSS attacks. The issue affects physical and virtual firewall appliances (PA-Series, VM-Series) and Panorama management devices but does not impact the Cloud NGFW or Prisma Access services. The CVSS 4.0 base score is 1.1, indicating low severity. There is no vendor advisory or patch information available at this time.
Potential Impact
An authenticated administrator could store malicious JavaScript code in the web interface, which might be executed in the context of other administrators' browsers. The impact is limited by the requirement for authenticated access and the low CVSS score. There is no indication of remote unauthenticated exploitation or system compromise.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict administrative access to trusted personnel only and monitor for unusual administrative activity. No official fix or temporary workaround has been published by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- palo_alto
- Date Reserved
- 2025-11-03T20:44:26.433Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a29d0220e53e7388398699a
Added to database: 06/10/2026, 20:59:14 UTC
Last enriched: 07/15/2026, 11:21:41 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 57
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