PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
Published May 13, 2026
4.4
MEDIUMCVSS 4.0
EPSS 0.18%
Description
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.
Affected products
-
- Version 10.2.0StatusaffectedConstraints<10.2.18-h6
- Version 11.1.0StatusaffectedConstraints<11.1.15
- Version 11.2.0StatusaffectedConstraints<11.2.12
- Version 12.1.0StatusaffectedConstraints<12.1.7
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Palo Alto Networks | Pan-OS | unaffected |
|
Configuration 1
- < 10.2.7
- ≥ 10.2.8 · < 10.2.10
- ≥ 10.2.11 · < 10.2.13
- ≥ 10.2.14 · < 10.2.16
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.7
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.10
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.13
- 10.2.16
- 10.2.16
- 10.2.16
- 10.2.16
- 10.2.17
- 10.2.18
- 10.2.18
- 10.2.18
Configuration 2
- ≥ 11.1.0 · < 11.1.4
- ≥ 11.1.5 · < 11.1.6
- ≥ 11.1.8 · < 11.1.10
- ≥ 11.1.11 · < 11.1.13
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.4
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.6
- 11.1.7
- 11.1.7
- 11.1.7
- 11.1.7
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.10
- 11.1.13
- 11.1.13
- 11.1.13
- 11.1.13
- 11.1.14
Configuration 3
- ≥ 11.2.0 · < 11.2.4
- ≥ 11.2.5 · < 11.2.7
- ≥ 11.2.8 · < 11.2.10
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.4
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.7
- 11.2.10
- 11.2.10
- 11.2.10
- 11.2.10
- 11.2.10
- 11.2.10
- 11.2.11
Configuration 4
- ≥ 12.1.0 · < 12.1.4
- ≥ 12.1.5 · < 12.1.7
- 12.1.4
- 12.1.4
- 12.1.4
Configuration 5
- n/a
Running on/with
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
VERSION MINOR VERSION RANGE SUGGESTED SOLUTION Cloud NGFW No action needed. PAN-OS 12.1 12.1.5 through 12.1.6 Upgrade to 12.1.7 or later. 12.1.2 through 12.1.4-h* Upgrade to 12.1.4-h5 or 12.1.7 or later. PAN-OS 11.2 11.2.11 or later Upgrade to 11.2.12 or later. 11.2.8 through 11.2.10-h* Upgrade to 11.2.10-h6 or 11.2.12 or later. 11.2.5 through 11.2.7-h* Upgrade to 11.2.7-h13 or 11.2.12 or later. 11.2.0 through 11.2.4-h* Upgrade to 11.2.4-h17 or 11.2.12 or later. PAN-OS 11.1 11.1.14 or later Upgrade to 11.1.15 or later. 11.1.11 through 11.1.13-h* Upgrade to 11.1.13-h5 or 11.1.15 or later. 11.1.8 through 11.1.10-h* Upgrade to 11.1.10-h25 or 11.1.15 or later. 11.1.7 through 11.1.7-h* Upgrade to 11.1.7-h6 or 11.1.15 or later. 11.1.5 through 11.1.6-h* Upgrade to 11.1.6-h32 or 11.1.15 or later. 11.1.0 through 11.1.4-h* Upgrade to 11.1.4-h33 or 11.1.15 or later. PAN-OS 10.2 10.2.17 through 10.2.18-h* Upgrade to 10.2.18-h6 or later. 10.2.14 through 10.2.16-h* Upgrade to 10.2.16-h7 or 10.2.18-h6 or later. 10.2.11 through 10.2.13-h* Upgrade to 10.2.13-h21 or 10.2.18-h6 or later. 10.2.8 through 10.2.10-h* Upgrade to 10.2.10-h36 or 10.2.18-h6 or later. 10.2.0 through 10.2.7-h* Upgrade to 10.2.7-h34 or 10.2.18-h6 or later. All older Upgrade to a supported fixed version. unsupported PAN-OS versions Prisma Access No action needed.
Metrics
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
1 other source (NVD) ▾
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/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
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 13, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.18% (0.00179) | 6.70th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.28% (0.00280) | 19.49th | v5 (v2026.06.15) |
| May 14, 2026 | 0.04% (0.00043) | 13.30th | v4 (v2025.03.14) |
References (2)
- https://cert-portal.siemens.com/productcert/html/ssa-967325.html Third Party Advisory
- https://security.paloaltonetworks.com/CVE-2026-0256 vendor-advisoryVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-967325.html | Third Party Advisory | |
| https://security.paloaltonetworks.com/CVE-2026-0256 | vendor-advisoryVendor Advisory |
Change history (0)
No recorded changes yet.