CVE-2026-20194 in Identity Services Engine
Summary
by MITRE • 09/16/2026
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC), engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-20194 are related to incorrect resource transfer between spheres that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-669.
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Analysis
by VulDB Data Team • 09/16/2026
Cisco has released a software hardening update for Cisco Identity Services Engine and Cisco ISE Passive Identity Connector following an internal security review aimed at addressing multiple internally discovered vulnerabilities. This proactive measure underscores the vendor's commitment to maintaining product quality and securing critical identity management infrastructure against emerging threats. The specific vulnerability tracked under CVE-2026-20194 stems from a flaw in how resources are managed across different trust boundaries within the application architecture.
The core technical issue involves an incorrect transfer of resources between isolated security spheres, which is categorized under CWE-669: Improper Resource Transfer Between Spheres. This weakness typically occurs when data or control flow moves from one execution context to another without adequate validation or sanitization. In the context of Cisco ISE, this likely pertains to how session states, authentication tokens, or policy decisions are passed between different components such as the administration interface and the operational engine. The failure to properly enforce boundaries allows for potential state manipulation where an actor might influence outcomes in a higher-privilege sphere using inputs intended for a lower-privilege one.
From an offensive security perspective, this flaw aligns with ATT&CK technique T1078: Valid Accounts or potentially T1621: Multi-Factor Request Interception if the resource transfer involves authentication factors. An attacker could exploit this misconfiguration to bypass access controls by manipulating session identifiers or policy enforcement points. The operational impact of such a vulnerability is significant, as Cisco ISE serves as a central hub for network access control and identity governance. A successful exploitation could lead to unauthorized access to protected resources, privilege escalation within the management plane, or disruption of authentication services affecting entire enterprise networks relying on these systems for zero-trust enforcement.
Mitigation strategies primarily involve applying the provided software hardening release immediately to patch the identified logic errors in resource handling. Administrators should ensure that all instances of Cisco ISE and Passive Identity Connector are updated to the latest secure version recommended by engineering teams. Additionally, network segmentation policies should be reviewed to limit lateral movement opportunities if an attacker gains initial foothold within a lower-privilege segment. Continuous monitoring for anomalous authentication patterns or unexpected policy changes can help detect potential exploitation attempts in real-time while patching efforts are completed across the infrastructure.