Medium severity · published May 13, 2026
CVE-2026-0256
PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface
4.8
CVSS
0.2%
EPSS
No
On KEV
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.
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)0.2% · higher than 6% 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 12.1.7; 11.2.0 before 11.2.12; 11.1.0 before 11.1.15; 10.2.0 before 10.2.18-h6 · source: vendor, NVD
RA
Ruggedcom Ape1808 Firmware · Siemens
All versions, or not specified · source: NVD
RA
RUGGEDCOM APE1808 · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0256
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0256
Vendor Advisory
https://security.paloaltonetworks.com/CVE-2026-0256
Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-967325.html
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