Chamilo LMS, an open-source learning management system, suffers from an OS Command Injection vulnerability identified as CVE-2025-50196. The vulnerability is located in the file /plugin/vchamilo/views/editinstance.php and is triggered via the POST parameter 'main_database'. Prior to version 1.11.30, this parameter is improperly sanitized, allowing an attacker to inject malicious OS commands. The vulnerability corresponds to CWE-78, indicating improper neutralization of special elements used in OS commands. Exploitation requires the attacker to have high privileges (PR:H) but does not require user interaction (UI:N) or authentication tokens beyond those privileges. The CVSS 4.0 base score is 7.1, reflecting a high severity due to the potential for remote command execution, impacting confidentiality, integrity, and availability. The vulnerability affects all Chamilo LMS installations running versions older than 1.11.30. Although no known exploits are reported in the wild, the risk remains significant given the nature of the flaw. The issue was reserved in June 2025 and published in March 2026, with the vendor releasing a patch in version 1.11.30 to properly sanitize input and prevent command injection.

Successful exploitation of this vulnerability can lead to remote execution of arbitrary OS commands on the server hosting Chamilo LMS. This can compromise the confidentiality of sensitive educational data, alter or delete critical information, and disrupt LMS availability, potentially causing denial of service. Attackers with high privileges could leverage this flaw to escalate control over the system, pivot within the network, or deploy malware. Organizations relying on Chamilo LMS for educational services may face operational disruption, data breaches, and reputational damage. The impact is especially critical for institutions managing sensitive student or staff data. Since the vulnerability does not require user interaction, automated exploitation is feasible once an attacker gains the necessary privileges, increasing the risk of rapid compromise.

The primary mitigation is to upgrade Chamilo LMS to version 1.11.30 or later, where the vulnerability is patched. Organizations should audit their LMS installations to identify affected versions and prioritize patching. In environments where immediate upgrade is not possible, implement strict access controls to limit high-privilege user accounts and monitor for suspicious activity related to the 'main_database' parameter. Employ web application firewalls (WAFs) with custom rules to detect and block command injection patterns targeting this endpoint. Conduct regular security assessments and code reviews focusing on input validation and sanitization. Additionally, isolate LMS servers within segmented network zones to reduce lateral movement risk if compromised. Maintain comprehensive logging and alerting to detect exploitation attempts promptly.