Medium severity · published Jun 10, 2026
CVE-2026-0266
PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
4.8
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
PAN-OS · Palo Alto Networks
12.1.0 before 12.1.5; 11.2.0 before 11.2.11; 11.1.0 before 11.1.14; 10.2.0 · source: vendor, NVD
RA
RUGGEDCOM APE1808 · Siemens
0 · source: CISA
In the news
VulnerabilityHigh
Siemens RUGGEDCOM APE1808 with Palo Alto Networks Virtual NGFW
View CSAF
Summary
Palo Alto Networks has published [1] information on vulnerabilities in PAN-OS. This advisory lists the related Siemens Industrial products affected by these vulnerabilities. Customers are advised to consult and implement the workarounds provided in Palo Alto Networks' upstream security notifications. [1] https://security.paloaltonetworks.com/
The following versions of Siemens RUGGEDCOM APE1808 with Palo Alto Networks Virtual NGFW are affected:
RUGGEDCOM APE1808 vers:all/*
CVSS
Vendor
Equipment
Vulnerabilities
v3 7.2
Siemens
Siemens RUGGEDCOM APE1808 with Palo Alto Networks Virtual NGFW
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), Missing Authorization, Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Background
Critical Infrastructure Sectors: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
Vulnerabilities
Expand All +
CVE-2026-0266
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.
View CVE Details
Aff...
Jul 21, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0266
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0266
Vendor Advisory
https://security.paloaltonetworks.com/CVE-2026-0266
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-104023.html
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