PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
Summary
| CVE | CVE-2026-0266 |
|---|---|
| State | PUBLISHED |
| Assigner | palo_alto |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-10 22:16:52 UTC |
| Updated | 2026-06-11 15:21:30 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 1.1 LOW from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Amber
EPSS: 0.002130000 probability, percentile 0.115330000 (date 2026-06-17)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 1.1 | LOW | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/C... |
| 4.0 | CNA | CVSS | 1.1 | LOW | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/A... |
| 4.0 | CNA | CVSS | 0.4 | LOW | CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/A... |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:D/RE:M/U:Amber
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Palo Alto Networks | Cloud NGFW | unaffected All custom | Not specified |
| CNA | Palo Alto Networks | PAN-OS | affected 12.1.0 12.1.5 custom | Not specified |
| CNA | Palo Alto Networks | PAN-OS | affected 11.2.0 11.2.11 custom | Not specified |
| CNA | Palo Alto Networks | PAN-OS | affected 11.1.0 11.1.14 custom | Not specified |
| CNA | Palo Alto Networks | PAN-OS | affected 10.2.0 custom | Not specified |
| CNA | Palo Alto Networks | Prisma Access | unaffected All custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.paloaltonetworks.com/CVE-2026-0266 | [email protected] | security.paloaltonetworks.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Palo Alto Networks thanks Rajnish Gupta (internal reporter), James Otten (internal reporter), and Jasper Westerman of REQON B.V. for discovering and reporting this issue. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-06-10T16:00:00.000Z | Initial publication. |
Solutions
CNA: VERSION MINOR VERSION SUGGESTED SOLUTION Cloud NGFW No action needed. PAN-OS 12.1 12.1.2 through 12.1.4 Upgrade to 12.1.5 or later. PAN-OS 11.2 11.2.0 through 11.2.10 Upgrade to 11.2.11 or later. PAN-OS 11.1 11.1.0 through 11.1.13 Upgrade to 11.1.14 or later. PAN-OS 10.2 10.2.0 through 10.2.18 Upgrade to 11.1.14, 11.2.11, 12.1.5 or later. All older Upgrade to a supported fixed version. unsupported PAN-OS versions Prisma Access No action needed.
Workarounds
CNA: No known workarounds or mitigations exist for this issue.
Exploits
CNA: Palo Alto Networks is not aware of any malicious exploitation of this issue.