CVE-2026-2131 is an OS command injection vulnerability identified in the HarmonyOS-mcp-server version 0.1.0 developed by XixianLiang. The flaw resides in the input_text function, where the argument 'text' is improperly sanitized or validated, allowing an attacker to inject arbitrary operating system commands. This vulnerability can be exploited remotely without requiring user interaction or prior authentication, though it requires low privileges (PR:L). The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no user interaction (UI:N), and partial impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The vulnerability does not affect system confidentiality, integrity, or availability completely but can lead to significant compromise if exploited. The exploit code is publicly available, increasing the risk of exploitation, although no active exploitation has been reported yet. The vulnerability affects only version 0.1.0 of the product, which may limit the scope but still poses a risk to deployments using this version. The lack of patches currently necessitates temporary mitigations such as network restrictions and input validation. The vulnerability is categorized as medium severity due to the combination of ease of exploitation and partial impact on system security properties.

For European organizations, this vulnerability poses a risk of unauthorized command execution on systems running HarmonyOS-mcp-server 0.1.0. Successful exploitation could lead to data breaches, service disruption, or lateral movement within networks, impacting confidentiality, integrity, and availability of critical systems. Organizations in sectors such as telecommunications, manufacturing, and critical infrastructure that may deploy HarmonyOS-based solutions could face operational disruptions and reputational damage. The remote and unauthenticated nature of the exploit increases the attack surface, especially for internet-facing services. The availability of public exploit code further elevates the risk of opportunistic attacks. Given the medium severity, the impact is significant but not catastrophic, allowing time for mitigation if addressed promptly. Failure to mitigate could lead to targeted attacks exploiting this vulnerability to gain footholds in enterprise environments.

1. Immediately restrict network access to the HarmonyOS-mcp-server 0.1.0 instance, especially from untrusted networks, using firewalls or network segmentation. 2. Implement strict input validation and sanitization on the input_text function to prevent command injection, including escaping or rejecting suspicious characters and patterns. 3. Monitor logs and network traffic for unusual command execution attempts or anomalies related to the vulnerable service. 4. Deploy host-based intrusion detection systems (HIDS) to detect suspicious OS command executions. 5. Apply any vendor patches or updates as soon as they become available. 6. If patching is not immediately possible, consider disabling or isolating the vulnerable service to prevent exploitation. 7. Conduct a thorough audit of all systems running HarmonyOS-mcp-server to identify and remediate vulnerable versions. 8. Educate system administrators about the risks and signs of exploitation related to this vulnerability. 9. Employ application whitelisting and least privilege principles to limit the impact of potential command injection. 10. Regularly update and test incident response plans to handle potential exploitation scenarios.