CVE-2025-50196 Overview
CVE-2025-50196 is an OS Command Injection vulnerability discovered in Chamilo, an open-source learning management system (LMS). The vulnerability exists in the /plugin/vchamilo/views/editinstance.php file and can be exploited via the POST main_database parameter. This flaw allows authenticated attackers with high privileges to execute arbitrary operating system commands on the underlying server, potentially leading to complete system compromise.
Critical Impact
Authenticated attackers can execute arbitrary OS commands on vulnerable Chamilo LMS servers, potentially resulting in data exfiltration, system takeover, or lateral movement within the network infrastructure.
Affected Products
- Chamilo LMS versions prior to 1.11.30
- All installations using the vchamilo plugin with editinstance.php functionality
- Self-hosted Chamilo deployments on any operating system
Discovery Timeline
- 2026-03-02 - CVE-2025-50196 published to NVD
- 2026-03-03 - Last updated in NVD database
Technical Details for CVE-2025-50196
Vulnerability Analysis
This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The flaw resides in the Virtual Chamilo (vchamilo) plugin, specifically within the instance editing functionality. When processing the main_database parameter in POST requests to editinstance.php, the application fails to properly sanitize user-supplied input before passing it to system-level commands.
The attack can be executed remotely over the network without requiring user interaction, though it does require high-level privileges (administrative access) within the Chamilo LMS application. Successful exploitation can result in limited confidentiality impact but high integrity and availability impact on the vulnerable system.
Root Cause
The root cause of this vulnerability is insufficient input validation and sanitization of the main_database POST parameter in the vchamilo plugin. The application directly incorporates user-controlled input into OS command execution contexts without proper escaping or validation of shell metacharacters. This allows attackers to inject arbitrary commands by including command separators (such as ;, |, &&, or backticks) within the parameter value.
Attack Vector
The attack vector is network-based, requiring an authenticated attacker with administrative privileges to submit a specially crafted POST request to the vulnerable endpoint. The attacker can manipulate the main_database parameter to include shell metacharacters followed by malicious commands. Since the input is not properly sanitized, these commands are executed with the privileges of the web server process.
An attacker would craft a malicious POST request targeting /plugin/vchamilo/views/editinstance.php with a payload injected into the main_database parameter. The injected commands could be used to establish reverse shells, exfiltrate sensitive data, modify system configurations, or pivot to other systems on the network. For detailed technical information about the vulnerability mechanism, refer to the GitHub Security Advisory GHSA-qfvp-xg47-m7m2.
Detection Methods for CVE-2025-50196
Indicators of Compromise
- Unusual POST requests to /plugin/vchamilo/views/editinstance.php containing shell metacharacters (;, |, &&, `, $()) in the main_database parameter
- Unexpected process spawning from the web server process (e.g., /bin/sh, /bin/bash, cmd.exe)
- Anomalous network connections originating from the web server to external IP addresses
- Suspicious file system modifications or new files appearing in web-accessible directories
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block command injection patterns in POST requests to Chamilo endpoints
- Monitor web server access logs for requests to /plugin/vchamilo/views/editinstance.php with unusual parameter values
- Deploy endpoint detection and response (EDR) solutions to identify child process spawning from web server processes
- Configure intrusion detection systems (IDS) to alert on outbound connections from web server hosts to unexpected destinations
Monitoring Recommendations
- Enable verbose logging for the Chamilo application and regularly review for anomalous activity
- Implement file integrity monitoring on critical system directories and Chamilo installation paths
- Monitor system calls and process creation events on servers hosting Chamilo LMS
- Set up alerting for any authentication events involving administrative accounts accessing the vchamilo plugin
How to Mitigate CVE-2025-50196
Immediate Actions Required
- Upgrade Chamilo LMS to version 1.11.30 or later immediately
- If immediate patching is not possible, disable or restrict access to the vchamilo plugin
- Review server access logs for any signs of prior exploitation attempts
- Implement network segmentation to limit the blast radius of potential compromise
Patch Information
Chamilo has addressed this vulnerability in version 1.11.30. The fix involves proper input sanitization for the main_database parameter to prevent OS command injection. Organizations should apply the security patches immediately by upgrading to the latest version. The security fixes can be reviewed in the following commits:
The patched version is available at the GitHub Release v1.11.30.
Workarounds
- Temporarily disable the vchamilo plugin if it is not required for operations
- Implement strict access controls limiting which IP addresses can reach administrative interfaces
- Deploy a web application firewall (WAF) with rules to filter command injection attempts targeting the affected parameter
- Consider placing the Chamilo application behind a VPN to reduce exposure to external attackers
# Example: Restrict access to vchamilo plugin directory in Apache
<Directory "/var/www/chamilo/plugin/vchamilo">
Require ip 192.168.1.0/24
# Or deny all access if plugin is not needed
# Require all denied
</Directory>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
