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CVE-2026-0256

MEDIUMCVSS 4.8/10EPSS 0.28%

Last modified

CVE-2026-0256 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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.. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
4.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS 4.0
4.4/10

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

EPSS Probability
0.28%

19.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PaloaltonetworksPan-Os< 10.2.7
PaloaltonetworksPan-Os>= 10.2.8, < 10.2.10
PaloaltonetworksPan-Os>= 10.2.11, < 10.2.13
PaloaltonetworksPan-Os>= 10.2.14, < 10.2.16
PaloaltonetworksPan-Os10.2.7
PaloaltonetworksPan-Os10.2.10
PaloaltonetworksPan-Os10.2.13
PaloaltonetworksPan-Os10.2.16
PaloaltonetworksPan-Os10.2.17
PaloaltonetworksPan-Os10.2.18
PaloaltonetworksPan-Os>= 11.1.0, < 11.1.4
PaloaltonetworksPan-Os>= 11.1.5, < 11.1.6
PaloaltonetworksPan-Os>= 11.1.8, < 11.1.10
PaloaltonetworksPan-Os>= 11.1.11, < 11.1.13
PaloaltonetworksPan-Os11.1.4
PaloaltonetworksPan-Os11.1.6
PaloaltonetworksPan-Os11.1.7
PaloaltonetworksPan-Os11.1.10
PaloaltonetworksPan-Os11.1.13
PaloaltonetworksPan-Os11.1.14
PaloaltonetworksPan-Os>= 11.2.0, < 11.2.4
PaloaltonetworksPan-Os>= 11.2.5, < 11.2.7
PaloaltonetworksPan-Os>= 11.2.8, < 11.2.10
PaloaltonetworksPan-Os11.2.4
PaloaltonetworksPan-Os11.2.7
PaloaltonetworksPan-Os11.2.10
PaloaltonetworksPan-Os11.2.11
PaloaltonetworksPan-Os>= 12.1.0, < 12.1.4
PaloaltonetworksPan-Os>= 12.1.5, < 12.1.7
PaloaltonetworksPan-Os12.1.4
SiemensRuggedcom Ape1808 FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-0256?
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.
How severe is CVE-2026-0256?
CVE-2026-0256 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.
How do I fix CVE-2026-0256?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST