CVE-2026-29014: MetInfo CMS RCE Vulnerability

CVE-2026-29014 Overview

MetInfo CMS versions 7.9, 8.0, and 8.1 contain an unauthenticated PHP code injection vulnerability that allows remote attackers to execute arbitrary code by sending crafted requests with malicious PHP code. Attackers can exploit insufficient input neutralization in the execution path to achieve remote code execution and gain full control over the affected server.

This vulnerability is classified as Code Injection (CWE-94), representing a severe security flaw that enables attackers to inject and execute arbitrary PHP code without requiring authentication, potentially leading to complete server compromise.

Critical Impact

Remote attackers can achieve unauthenticated remote code execution and gain full control over affected MetInfo CMS servers without any authentication requirements.

Affected Products

• MetInfo CMS version 7.9
• MetInfo CMS version 8.0
• MetInfo CMS version 8.1

Discovery Timeline

• 2026-04-01 - CVE-2026-29014 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-29014

Vulnerability Analysis

This vulnerability stems from improper input validation and insufficient neutralization of user-supplied data within the MetInfo CMS application. The flaw allows unauthenticated remote attackers to inject malicious PHP code through specially crafted HTTP requests. Once injected, this code is executed by the server in the context of the web application, granting attackers the ability to run arbitrary commands on the underlying system.

The network-based attack vector means this vulnerability can be exploited remotely without requiring any prior access to the target system. The absence of authentication requirements significantly increases the risk, as any attacker who can reach the vulnerable endpoint can potentially exploit this flaw. Successful exploitation results in complete compromise of the affected server, including the ability to read sensitive data, modify files, install backdoors, and pivot to other systems within the network.

Root Cause

The root cause of CVE-2026-29014 is insufficient input neutralization in the PHP code execution path. The MetInfo CMS application fails to properly sanitize user-controlled input before incorporating it into code that is subsequently executed by the PHP interpreter. This lack of proper input validation allows attackers to inject malicious PHP statements that are processed as legitimate code.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted HTTP requests containing malicious PHP code to vulnerable MetInfo CMS installations. The crafted payloads bypass insufficient input validation mechanisms and are processed by the server, resulting in arbitrary code execution.

The exploitation process involves identifying vulnerable MetInfo CMS instances, crafting malicious requests that inject PHP code into the vulnerable execution path, and triggering the code execution to establish control over the target server. For detailed technical information, see the Karma Insecurity Advisory KIS-2026-06 and the VulnCheck Advisory on MetInfo CMS.

Detection Methods for CVE-2026-29014

Indicators of Compromise

• Unusual PHP process spawning or child processes executing system commands
• Web server logs containing suspicious requests with PHP function names such as eval(), exec(), system(), or passthru() in request parameters
• Unexpected file modifications in the MetInfo CMS installation directory
• New or modified PHP files that were not part of legitimate updates
• Anomalous outbound network connections originating from the web server

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing PHP code injection patterns
• Monitor web server access logs for requests with unusual parameter values containing PHP syntax or function calls
• Deploy file integrity monitoring on MetInfo CMS installation directories to detect unauthorized modifications
• Use intrusion detection systems (IDS) with signatures for PHP code injection attempts

Monitoring Recommendations

• Configure real-time alerting for any detection of code injection patterns in HTTP traffic
• Establish baseline behavior for MetInfo CMS servers and alert on deviations such as unexpected process execution
• Monitor for unauthorized administrative access or creation of new user accounts within the CMS
• Track outbound connections from web servers to identify potential command-and-control communications

How to Mitigate CVE-2026-29014

Immediate Actions Required

• Identify all MetInfo CMS installations running versions 7.9, 8.0, or 8.1 and prioritize them for patching
• Implement network segmentation to limit exposure of vulnerable MetInfo CMS servers
• Deploy web application firewall rules to block requests containing PHP code injection payloads
• Consider temporarily taking vulnerable instances offline if they are not business-critical until patches are applied
• Review server logs for evidence of exploitation attempts or successful compromise

Patch Information

Organizations should check the MetInfo CMS website for the latest security updates and patch releases. Apply vendor-provided patches as soon as they become available. Monitor the Karma Insecurity Advisory and VulnCheck Advisory for updated remediation guidance.

Workarounds

• Restrict network access to MetInfo CMS administrative interfaces using firewall rules or access control lists
• Implement strict input validation at the reverse proxy or load balancer level to filter suspicious requests
• Disable any unnecessary PHP functions such as eval(), exec(), system(), and passthru() in the php.ini configuration
• Consider placing vulnerable systems behind a VPN to limit exposure to trusted users only

# Example php.ini hardening to disable dangerous functions
# Add or modify the disable_functions directive in php.ini
disable_functions = eval,exec,system,passthru,shell_exec,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source