CVE-2026-5023 is an OS command injection vulnerability identified in the DeDeveloper23 codebase-mcp project, affecting the functions getCodebase, getRemoteCodebase, and saveCodebase located in src/tools/codebase.ts within the RepoMix Command Handler component. The vulnerability arises from insufficient input validation or sanitization, allowing an attacker with local access and limited privileges to inject and execute arbitrary operating system commands. This can lead to unauthorized command execution on the host system, potentially compromising system integrity and confidentiality. The vulnerability requires local access, does not require user interaction, and can be exploited with low attack complexity. The product uses a rolling release model, complicating version tracking and patch management. Despite early reporting, the vendor has not issued a fix or response, and no patches are currently available. While no known exploits are active in the wild, the public disclosure of the vulnerability increases the risk of exploitation, especially in environments where local access controls are weak or where the affected codebase is used in critical development or deployment pipelines.

The primary impact of CVE-2026-5023 is the potential for local attackers to execute arbitrary OS commands, which can lead to unauthorized access, data leakage, or system manipulation. Although exploitation requires local access and limited privileges, successful attacks could facilitate privilege escalation or lateral movement within an organization’s infrastructure. This could compromise the confidentiality, integrity, and availability of affected systems. Organizations relying on the DeDeveloper23 codebase-mcp component in development or production environments may face risks of codebase tampering, unauthorized code execution, or disruption of software delivery pipelines. The rolling release nature of the product complicates patching and version control, increasing the window of exposure. While no active exploits are reported, the public availability of the vulnerability details may prompt attackers to develop exploits, especially in environments with weak local access controls or insider threats.

1. Restrict local access to systems running the affected DeDeveloper23 codebase-mcp component, ensuring only trusted users have access. 2. Implement strict input validation and sanitization on all inputs to the getCodebase, getRemoteCodebase, and saveCodebase functions to prevent command injection. 3. Employ application-level sandboxing or containerization to limit the impact of potential command execution. 4. Monitor system logs and command execution traces for unusual or unauthorized activity related to the affected functions. 5. Use host-based intrusion detection systems (HIDS) to detect anomalous behavior indicative of exploitation attempts. 6. Engage with the vendor or community to track updates or patches addressing this vulnerability. 7. If possible, audit and review the source code for similar injection flaws in related components. 8. Consider implementing multi-factor authentication and privilege separation to reduce the risk of privilege escalation following local compromise. 9. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 10. Educate local users about the risks of executing untrusted code or commands on affected systems.