CVE-2016-20027 in ZKBioSecurity
Summary
by MITRE • 03/16/2026
ZKTeco ZKBioSecurity 3.0 contains multiple reflected cross-site scripting vulnerabilities that allow attackers to execute arbitrary HTML and script code by injecting malicious payloads through unsanitized parameters in multiple scripts. Attackers can craft malicious URLs with XSS payloads in vulnerable parameters to execute scripts in a user's browser session within the context of the affected application.
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Analysis
by VulDB Data Team • 03/16/2026
The CVE-2016-20027 vulnerability affects ZKTeco ZKBioSecurity 3.0, a biometric security management system widely deployed in enterprise and government environments for access control and attendance tracking. This vulnerability represents a critical security flaw in the web interface of the software, specifically targeting the application's handling of user input parameters. The affected system operates as a centralized biometric security platform that manages multiple devices including fingerprint readers, card readers, and time and attendance systems, making it a prime target for attackers seeking persistent access to security infrastructure.
The technical flaw manifests as multiple reflected cross-site scripting vulnerabilities within the application's web interface components. These vulnerabilities occur when the software fails to properly sanitize user input parameters before reflecting them back to the browser in HTTP responses. The vulnerability affects various scripts throughout the application where user-supplied data is directly incorporated into web page content without adequate input validation or output encoding. Attackers can exploit these weaknesses by crafting malicious URLs containing XSS payloads in vulnerable parameters, which when clicked by an authenticated user, execute arbitrary HTML and JavaScript code within the victim's browser session. This reflected nature means the malicious code is not stored on the server but is instead reflected back to the user through the application's response, making it particularly dangerous for web-based security systems.
The operational impact of this vulnerability is severe given the nature of biometric security systems and their role in enterprise environments. An attacker who successfully exploits these XSS vulnerabilities can execute malicious scripts within the context of an authenticated user's session, potentially gaining unauthorized access to sensitive system functions and data. The attack surface extends beyond simple script execution to include potential privilege escalation, session hijacking, and data exfiltration from the biometric security management platform. The vulnerability particularly affects organizations that rely on ZKTeco systems for critical access control, as attackers could manipulate the system to grant unauthorized access to facilities or manipulate attendance records, creating potential security breaches and audit trail corruption. This vulnerability undermines the integrity of the entire security infrastructure by allowing attackers to compromise the management interface that controls access to physical security devices.
Organizations should implement immediate mitigations including input validation and output encoding for all user-supplied parameters, regular security updates and patches from ZKTeco, and network segmentation to limit access to the biometric security management systems. The vulnerability aligns with CWE-79, which describes cross-site scripting flaws where untrusted data is incorporated into web pages without proper sanitization. From an attack perspective, this vulnerability maps to ATT&CK technique T1059.007 for scripting and T1566 for spearphishing with attachments, as attackers would likely use crafted URLs to deliver malicious payloads. Network monitoring should be enhanced to detect suspicious URL patterns and anomalous user behavior that might indicate exploitation attempts. Additionally, implementing content security policies and disabling unnecessary web interfaces can significantly reduce the attack surface. Regular security assessments of web applications and mandatory patch management procedures are essential to prevent exploitation of similar vulnerabilities in the future. The vulnerability demonstrates the critical importance of secure coding practices in security infrastructure applications where user input validation is paramount to maintaining system integrity and preventing unauthorized access to critical security functions.