CVE-2026-2131 is an OS command injection vulnerability identified in the HarmonyOS-mcp-server 0.1.0 developed by XixianLiang. The vulnerability resides in the input_text function, where the argument text is not properly sanitized or validated before being passed to an operating system command execution context. This improper input handling allows an attacker to inject arbitrary OS commands remotely, potentially leading to unauthorized command execution on the affected system. The attack vector is network-based (AV:N), requiring no user interaction (UI:N) but does require low privileges (PR:L), indicating that an attacker with limited access could exploit this flaw. The vulnerability impacts confidentiality, integrity, and availability to a limited extent (VC:L, VI:L, VA:L) and does not require any special authentication or user interaction, making it more accessible to attackers who have some level of access. The CVSS 4.0 score of 5.3 reflects these factors, categorizing the vulnerability as medium severity. No patches or official fixes have been linked yet, and while no exploits are confirmed in the wild, publicly available proof-of-concept exploits increase the urgency for mitigation. The affected product, HarmonyOS-mcp-server, is part of the HarmonyOS ecosystem, which is primarily used in China and select Asian markets, often in IoT and embedded device contexts.

If exploited, this vulnerability could allow attackers to execute arbitrary operating system commands remotely on affected HarmonyOS-mcp-server instances. This could lead to unauthorized access, data leakage, system manipulation, or disruption of services. Given the medium severity, the impact on confidentiality, integrity, and availability is moderate but still significant for organizations relying on this software for critical operations. Attackers could leverage this flaw to pivot within networks, escalate privileges, or disrupt device functionality. The presence of publicly available exploits increases the likelihood of exploitation attempts, especially in environments where the vulnerable version remains unpatched. Organizations using HarmonyOS-mcp-server 0.1.0 in IoT or embedded systems could face operational disruptions or data breaches, particularly if these systems are exposed to untrusted networks.

Organizations should immediately identify and inventory all instances of HarmonyOS-mcp-server version 0.1.0 within their environments. Since no official patches are currently linked, temporary mitigations include restricting network access to the affected service, implementing strict input validation and sanitization at the application layer if possible, and employing network-level protections such as firewalls and intrusion detection systems to monitor and block suspicious command injection attempts. Additionally, applying the principle of least privilege to limit the permissions of the HarmonyOS-mcp-server process can reduce the potential impact of exploitation. Monitoring logs for unusual command execution patterns and anomalous behavior is critical. Organizations should stay alert for official patches or updates from XixianLiang and apply them promptly once available. Finally, consider isolating vulnerable devices from critical network segments until remediation is complete.