CVE-2026-20192 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-2026-20192 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.
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Analysis
by VulDB Data Team • 09/16/2026
Cisco Identity Services Engine and Cisco ISE Passive Identity Connector have undergone a comprehensive internal security review aimed at enhancing product quality and proactive defense capabilities. This rigorous assessment identified several critical software vulnerabilities that were subsequently addressed through a dedicated hardening release. The primary focus of this remediation effort centers on CVE-2026-20192, which is categorized under the Common Weakness Enumeration pillar CWE-284, representing Improper Access Control. These flaws indicate weaknesses in how the system validates user privileges and enforces authorization policies during administrative interactions with the platform.
The technical nature of these vulnerabilities involves insufficient checks on access control lists or role-based permissions within the ISE architecture. In a typical operational scenario, an attacker who has obtained valid credentials for a lower-privileged account may exploit these flaws to escalate their rights beyond what is intended by the system administrators. This could allow unauthorized entities to modify security policies, view sensitive network topology data, or manipulate authentication rules that govern access to corporate resources. The flaw essentially bypasses the expected separation of duties and privilege boundaries established during initial configuration.
From an operational perspective, successful exploitation of these vulnerabilities can lead to significant compromise of the identity management infrastructure. Since Cisco ISE serves as a central point for network access control and policy enforcement across many enterprise environments, any unauthorized modification or disclosure of data poses severe risks. Attackers could potentially disable security controls, redirect traffic through malicious nodes, or exfiltrate credentials stored within the system. This undermines the integrity of zero-trust architectures that rely heavily on accurate identity verification and strict access governance to maintain network perimeter security.
Mitigation strategies primarily involve applying the provided software hardening release immediately to affected deployments. Organizations should ensure that all instances of Cisco ISE and Passive Identity Connector are updated to versions containing these patches. Additionally, administrators should review existing role-based access control configurations to verify that least privilege principles are strictly enforced across all user accounts. Regular audits of administrative activity logs can help detect any anomalous behavior indicative of attempted exploitation before significant damage occurs.
The vulnerability aligns with ATT&CK technique T1078, Valid Accounts, as it involves leveraging legitimate credentials to gain unauthorized access due to flawed permission checks. It also relates to MITRE CWE-269, Improper Privilege Management, which describes situations where a user is granted more privileges than necessary for their role. By addressing these issues through the latest software update and reinforcing internal security policies, organizations can significantly reduce their attack surface and maintain robust identity-based security controls within their network infrastructure.