CVE-2026-100214 in Dynamics Business Central
Summary
by MITRE • 10/13/2026
Deserialization of untrusted data in Dynamics Business Central allows an authorized attacker to execute code over a network.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified involves the improper deserialization of untrusted data within Microsoft Dynamics Business Central, a comprehensive enterprise resource planning solution designed for small and mid-sized businesses. This flaw stems from the application's handling of serialized objects received via network requests without adequate validation or sanitization mechanisms. When an authorized user interacts with specific endpoints that process these inputs, the system attempts to reconstruct complex object structures directly from the incoming data stream. If this input is crafted maliciously by an attacker who has valid credentials for a low-privilege account, it can trigger arbitrary code execution on the server hosting the application. This represents a critical security failure because it bypasses standard authentication controls through logic exploitation rather than credential theft or brute force attacks.
From a technical perspective, this issue aligns with Common Weakness Enumeration (CWE) category CWE-502, which describes deserialization of untrusted data. The root cause lies in the use of insecure serialization libraries that allow for the instantiation of arbitrary classes during the parsing process. Attackers can exploit this by constructing specific serialized payloads containing gadget chains—sequences of object methods that perform dangerous operations such as file system access or command execution when invoked automatically by the deserialization engine. Because Dynamics Business Central operates within a trusted network environment, many security controls may be less stringent regarding input validation for authenticated users, inadvertently creating an attack surface where internal logic flaws can be leveraged to escalate privileges beyond their intended scope.
The operational impact of this vulnerability is severe, as it allows for remote code execution with the permissions of the compromised user account. In typical deployments, even a standard business user may have access to sensitive financial data, customer records, and inventory management systems. Successful exploitation could lead to unauthorized modification or deletion of critical business data, leading to significant operational disruptions and potential regulatory compliance violations under frameworks such as GDPR or HIPAA if personal health information is involved. Furthermore, the compromised server can serve as a pivot point for lateral movement within the corporate network, allowing attackers to target other systems with higher security privileges, thereby escalating from initial access to full domain compromise in multi-tiered environments.
This vulnerability maps directly to several tactics and techniques within the MITRE ATT&CK framework. Specifically, it falls under Initial Access via Valid Accounts (T1078) since exploitation requires valid credentials, followed by Execution through Command and Scripting Interpreter or Native API execution depending on the payload used. The persistence aspect is also a concern if the attacker modifies application configurations to maintain access after reboot cycles. Defense-in-depth strategies are essential for mitigation. Organizations should immediately apply vendor-provided security patches that address this deserialization flaw. Additionally, implementing strict input validation and output encoding practices in custom extensions or integrations connected to Business Central can reduce risk. Network segmentation should be enforced to limit the blast radius of any potential compromise, ensuring that servers hosting critical business applications are isolated from general user networks. Regular audits of application logs for anomalous deserialization events can also aid in early detection and response efforts.