CVE-2026-20192 Cisco CVE debrief

Who should care

System administrators and security professionals responsible for Cisco ISE and Cisco ISE Passive Identity Connector installations should assess exposure and apply necessary patches. This vulnerability requires immediate attention due to its critical severity and potential impact on system security.

Why it matters

CVE-2026-20192 is a critical vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) due to improper access control. System administrators and security professionals should assess exposure and apply necessary patches.

• Verify access controls are properly configured and enforced to prevent unauthorized access.
• Inventory Cisco ISE and Cisco ISE Passive Identity Connector installations to identify potential exposure.
• Monitor Cisco ISE and Cisco ISE Passive Identity Connector systems for unusual activity.
• Apply patches from Cisco for affected versions of Cisco ISE and Cisco ISE Passive Identity Connector.

Technical summary

CVE-2026-20192 is a critical vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) due to improper access control. The vulnerability has a CVSS score of 10 and is tracked under CWE-284. Affected versions include Cisco ISE 3.1.0 to 3.5.0 and Cisco ISE Passive Identity Connector 3.1.0 to 3.4.0. Cisco has provided a software hardening release to address this issue.

Defensive priority

High

Recommended defensive actions

• Review and apply patches from Cisco for affected versions of Cisco ISE and Cisco ISE Passive Identity Connector.
• Inventory Cisco ISE and Cisco ISE Passive Identity Connector installations to identify potential exposure.
• Monitor Cisco ISE and Cisco ISE Passive Identity Connector systems for unusual activity.
• Verify that access controls are properly configured and enforced.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its CVSS score, and affected versions. Cisco has provided a Security Advisory with patch information. Affected versions include Cisco ISE 3.1.0 to 3.5.0 and Cisco ISE Passive Identity Connector 3.1.0 to 3.4.0. Users should review the Cisco Security Advisory for specific patch information and apply necessary updates. The vulnerability has a CVSS score of 10 and is tracked under CWE-284.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.