PAN-OS Improper Cert Validation Lets Windows TS Agents Use Expired Certs
CVE-2026-0228 Published on February 11, 2026
PAN-OS: Improper Validation of Terminal Server Agent Certificate
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.
Vulnerability Analysis
CVE-2026-0228 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Timeline
Initial Publication
Weakness Type
Improper Certificate Validation
The software does not validate, or incorrectly validates, a certificate. When a certificate is invalid or malicious, it might allow an attacker to spoof a trusted entity by interfering in the communication path between the host and client. The software might connect to a malicious host while believing it is a trusted host, or the software might be deceived into accepting spoofed data that appears to originate from a trusted host.
Products Associated with CVE-2026-0228
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Affected Versions
Palo Alto Networks Cloud NGFW:- Version All is unaffected.
- Version 12.1.0 and below 11.2.8 is unaffected.
- Version 11.2.0 and below 11.2.8 is affected.
- Version 11.1.0 and below 11.1.11 is affected.
- Version 10.2.0 and below 10.2.17 is affected.
- Version 10.2.0 and below 10.2.10-h28 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.