CVE-2026-20198 in Enterprise NFV Infrastructure Software
Summary
by MITRE • 08/05/2026
A vulnerability in the web-based management interface of Cisco Integrated Management Controller (IMC) could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface.
This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.
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Analysis
by VulDB Data Team • 08/05/2026
The vulnerability exists within Cisco Integrated Management Controller's web-based management interface, representing a critical security weakness that enables authenticated remote attackers to perform cross-site scripting attacks. This flaw specifically manifests in the insufficient validation of user input parameters, creating an exploitable entry point for malicious actors seeking to compromise system integrity. The vulnerability operates through a sophisticated social engineering attack vector where an attacker crafts malicious links designed to exploit the interface's trust relationship with legitimate users.
The technical implementation of this XSS vulnerability stems from inadequate sanitization and validation mechanisms within the web application layer of Cisco IMC. When users navigate to crafted malicious URLs, the system fails to properly validate or escape user-supplied input before rendering it in web responses. This allows attacker-controlled data to be interpreted as executable script code by the victim's browser, bypassing standard security restrictions imposed by web browsers' same-origin policies. The vulnerability affects the authentication context of the web interface, meaning that while an attacker requires valid credentials to access the system, once authenticated they can leverage this flaw to escalate their attack capabilities.
From an operational impact perspective, successful exploitation enables attackers to execute arbitrary code within the victim's browser session, potentially leading to complete compromise of the management interface. Attackers can leverage this vulnerability to steal session cookies, capture sensitive information transmitted through the browser, or redirect users to malicious sites that further exploit their authenticated sessions. The attack requires minimal privileges since authentication is already established, making it particularly dangerous for organizations where administrative access to IMC systems is maintained by authorized personnel.
The security implications extend beyond immediate exploitation capabilities and align with CWE-79 Cross-site Scripting flaws classified under the Common Weakness Enumeration framework. This vulnerability demonstrates characteristics consistent with the ATT&CK technique T1059.007 Command and Scripting Interpreter: JavaScript, where attackers leverage browser-based scripting environments to execute malicious payloads. Organizations utilizing Cisco IMC systems face elevated risk when this vulnerability remains unpatched, as it provides an attack surface that combines both authentication bypass potential and client-side exploitation capabilities.
Mitigation strategies should prioritize immediate patch deployment through official Cisco security advisories and firmware updates. Network segmentation of management interfaces, implementation of web application firewalls, and regular monitoring for suspicious access patterns represent additional defensive measures. Administrators should also consider implementing strict input validation policies and conducting regular security assessments of web-based management interfaces to identify similar vulnerabilities that may exist within other system components.