CVE-2026-108796 in BioTime
Summary
by MITRE • 10/12/2026
A flaw has been found in ZKTeco BioTime 9.5.6 Build 20260130.3206. This affects an unknown part of the file /iclock/finger_data/ of the component Biometric Data Endpoint. Executing a manipulation of the argument emp_code can lead to authorization bypass. The attack can be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in ZKTeco BioTime 9.5.6 Build 20260130.3206 represents a critical security deficiency within the biometric data management subsystem, specifically affecting the file path /iclock/finger_data/. This component serves as the Biometric Data Endpoint, which is responsible for handling and processing fingerprint information used for identity verification in access control systems. The core technical flaw lies in the insufficient validation of the emp_code argument passed to this endpoint. In a properly secured system, such identifiers must be rigorously sanitized and validated against expected formats, lengths, and character sets before being processed by backend logic or database queries. However, in this instance, the application fails to adequately restrict or verify the input provided for emp_code, allowing an attacker to inject maliciously crafted data that alters the intended execution flow of the authentication mechanism.
This lack of proper input validation directly facilitates a remote authorization bypass. By manipulating the emp_code parameter through HTTP requests sent over the network, an unauthenticated actor can trick the system into granting access or retrieving sensitive biometric records without valid credentials. This type of flaw is classically categorized under CWE-20 Improper Input Validation and often leads to CWE-352 Cross-Site Request Forgery if the endpoint does not enforce strict origin checks, or more critically, CWE-89 SQL Injection if the emp_code value is concatenated directly into a database query without parameterization. The ability to bypass authorization controls remotely means that an attacker located outside the local network perimeter can exploit this weakness over standard web protocols such as HTTP or HTTPS, significantly expanding the attack surface beyond physical proximity requirements typically associated with biometric systems.
The operational impact of this vulnerability is severe for organizations relying on ZKTeco BioTime for workforce management and secure access control. Successful exploitation allows an adversary to impersonate legitimate employees by bypassing authentication checks, potentially leading to unauthorized physical entry into restricted areas or the theft of sensitive personal identifiable information stored in biometric databases. Since biometric data is inherently immutable and highly sensitive, a breach compromises not just current session security but long-term privacy for affected individuals. Furthermore, because vendor engagement has yielded no response despite early notification, organizations are left without official patches or guidance on mitigation strategies from the manufacturer, increasing reliance on compensating controls to secure these deployments against active exploitation in the wild.
To mitigate this risk in the absence of a vendor-provided fix, administrators should implement network-level restrictions such as firewall rules that limit access to the /iclock/finger_data/ endpoint exclusively to trusted internal IP addresses or specific application servers rather than exposing it to the public internet. Additionally, deploying a Web Application Firewall with custom rule sets capable of detecting and blocking anomalous patterns in emp_code parameters can provide an effective layer of defense against exploitation attempts. It is also advisable to audit system logs for unusual access patterns related to biometric data endpoints and consider isolating these services within segmented network zones to reduce lateral movement opportunities should a breach occur. Continuous monitoring aligned with MITRE ATT&CK techniques such as T1078 Valid Accounts or T1190 Exploit Public-Facing Application is recommended to detect potential abuse of this vulnerability in real-time environments where patching remains delayed due to vendor non-responsiveness.