CVE-2026-5041 identifies a command injection vulnerability in the Chamber of Commerce Membership Management System version 1.0 developed by code-projects. The vulnerability resides in the fwrite function call within the admin/pageMail.php file, where the parameters mailSubject and mailMessage are manipulated without proper sanitization or validation. This improper handling allows an attacker to inject arbitrary commands that the system executes, leading to command injection. The vulnerability can be exploited remotely without requiring user interaction, but it requires the attacker to have high privileges (PR:H), indicating that some form of authentication or elevated access is necessary before exploitation. The CVSS 4.0 vector indicates no user interaction (UI:N), no scope change (S:U), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no known exploits are currently observed in the wild, a public exploit is available, increasing the risk of exploitation by attackers. The vulnerability affects only version 1.0 of the product, and no official patches have been linked yet. The flaw could allow attackers to execute arbitrary commands on the server hosting the membership management system, potentially leading to data breaches, system compromise, or service disruption.

The vulnerability allows remote command injection, which can severely impact the confidentiality, integrity, and availability of affected systems. Attackers with high privileges can execute arbitrary commands, potentially leading to unauthorized data access, modification, or deletion. This can result in leakage of sensitive membership data, disruption of membership services, and compromise of the underlying server infrastructure. Organizations relying on this system for managing chamber of commerce memberships could face operational disruptions, reputational damage, and regulatory consequences if exploited. The medium CVSS score reflects the requirement for high privileges, which limits the attack surface but does not eliminate the risk, especially if internal threat actors or compromised credentials are involved. The availability of a public exploit increases the likelihood of exploitation attempts, making timely mitigation critical.

1. Implement strict input validation and sanitization on all user-supplied inputs, especially mailSubject and mailMessage parameters, to prevent injection of malicious commands. 2. Refactor or replace the use of fwrite in admin/pageMail.php to ensure it does not process untrusted input directly or use safer APIs that do not allow command execution. 3. Restrict access to the admin interface and sensitive functions to trusted users only, employing strong authentication and authorization controls. 4. Monitor logs for suspicious activity related to mailSubject and mailMessage inputs or unexpected command execution attempts. 5. Apply vendor patches or updates as soon as they become available. 6. Employ network segmentation and least privilege principles to limit the impact of a potential compromise. 7. Conduct regular security assessments and code reviews focusing on input handling and command execution functions. 8. If immediate patching is not possible, consider deploying web application firewalls (WAFs) with custom rules to detect and block command injection patterns targeting this vulnerability.