CVE-2026-16521 in MBD-X12STW-F
Summary
by MITRE • 10/27/2026
An OS command injection vulnerability exists because of insufficient input filtering. An attacker can inject a command payload into a BMC function; the payload may execute when the related service is restarted.
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Analysis
by VulDB Data Team • 10/27/2026
The identified vulnerability represents a critical security flaw within the Baseboard Management Controller, specifically stemming from inadequate validation and sanitization mechanisms applied to user-supplied inputs. This OS command injection weakness allows an external actor to manipulate how the system processes specific commands by injecting malicious shell metacharacters or logic operators into input fields that are subsequently passed to underlying operating system utilities without proper escaping. The core technical failure lies in the application's assumption that incoming data is safe, leading to a direct concatenation of user input with system-level command strings. This architectural oversight creates an execution path where arbitrary code can be run under the privileges associated with the BMC service account, which typically holds high-level administrative rights over hardware components and firmware settings.
The operational impact of this vulnerability is severe due to the privileged nature of Baseboard Management Controllers. These controllers serve as out-of-band management interfaces that provide remote access to server hardware for tasks such as power cycling, BIOS configuration, and firmware updates. If an attacker successfully exploits this injection vector, they can achieve complete compromise of the managed system's infrastructure. This includes the ability to read sensitive data stored on connected storage devices, modify critical boot configurations, install persistent backdoors at the firmware level, or disrupt service availability by executing destructive commands against the host operating system. The risk is further amplified because BMCs often operate on separate network segments and may have direct access to internal hardware buses that are otherwise isolated from standard user-facing networks.
The specific trigger condition described indicates that the malicious payload does not execute immediately upon input submission but rather during a service restart event. This delayed execution model suggests that the injected command is likely stored in a configuration file, database entry, or persistent storage location associated with the BMC software component. When the related service initializes or reloads its configuration, it parses these stored values and passes them to system shell interpreters for processing. This behavior implies that an attacker may need to perform two distinct actions: first, injecting the payload into a writable parameter via the web interface or API, and second, inducing a restart of the BMC service through legitimate administrative action or by exploiting another vulnerability that causes a service crash and automatic recovery.
From a classification perspective, this flaw aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command commonly known as OS Command Injection. The attack vector is categorized under ATT&CK technique T1059 Command and Scripting Interpreter, specifically leveraging the shell component to execute arbitrary commands remotely. Additionally, because it involves manipulating inputs that affect system configuration or state persistently, it may also relate to CWE-20 Improper Input Validation. The severity of this issue is heightened by its potential for privilege escalation if the BMC service runs with elevated permissions relative to other components on the management plane.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Immediate actions should include applying vendor-provided patches that address the input validation logic within the affected BMC firmware version. If patching is not immediately feasible, administrators should restrict network access to the BMC interface by placing it behind a firewall or in an isolated management VLAN accessible only from trusted administrative workstations. Input filtering must be implemented at multiple layers; however, relying solely on client-side blacklisting is insufficient and easily bypassed. Instead, developers must employ allow-listing techniques where input is validated against a strict set of expected characters and formats before being processed by any system-level functions. Parameterized interfaces or safe API calls that abstract away direct shell execution should replace raw command string concatenation to eliminate the injection surface entirely. Regular security audits and static code analysis focused on OS interaction points are essential to prevent similar vulnerabilities in future firmware releases.