CVE-2026-0256 | THREATINT

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.

PUBLISHED Reserved 2025-11-03 | Published 2026-05-13 | Updated 2026-05-13 | Assigner palo_alto

MEDIUM: 4.4CVSS: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

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status

unaffected

All (custom)

unaffected

Default status

unaffected

12.1.0 (custom) before 12.1.7

affected

11.2.0 (custom) before 11.2.12

affected

11.1.0 (custom) before 11.1.15

affected

10.2.0 (custom) before 10.2.18-h6

affected

Default status

unaffected

All (custom)

unaffected

Timeline

2026-05-13:

Initial publication.

Credits

Palo Alto Networks thanks our internal security research teams for discovering and reporting this issue. finder

References

security.paloaltonetworks.com/CVE-2026-0256 vendor-advisory

cve.org (CVE-2026-0256)

nvd.nist.gov (CVE-2026-0256)

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