XSS in Palo Alto Networks Cloud Ngfw
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Palo Alto Networks Cloud Ngfw — versions All
- Palo Alto Networks Pan-Os — versions 12.1.0, 11.2.0, 11.1.0
- Palo Alto Networks Prisma Access — versions All
- Paloaltonetworks Pan-Os — versions 10.2.7, 10.2.10, 10.2.13
- Siemens Ruggedcom Ape1808
- Siemens Ruggedcom Ape1808 Firmware
Weakness classification (CWE)
References
- security.paloaltonetworks.com/CVE-2026-0256 (vendor-advisory, Vendor Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-0256?
- CVE-2026-0256 is a medium-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-05-13.
- How severe is CVE-2026-0256?
- Medium severity. CVSS v3 base score is 4.8 out of 10.