CVE-2026-1105: EasyCMS SQL Injection Vulnerability

CVE-2026-1105 Overview

A SQL Injection vulnerability has been identified in EasyCMS versions up to 1.6. This vulnerability affects unknown code within the file /UserAction.class.php, where improper handling of the _order argument allows for SQL injection attacks. The attack can be executed remotely without authentication, and exploit code is publicly available. The vendor was contacted early about this disclosure but did not respond.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise.

Affected Products

• EasyCMS up to version 1.6

Discovery Timeline

• January 18, 2026 - CVE-2026-1105 published to NVD
• January 18, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1105

Vulnerability Analysis

This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The vulnerability exists in the /UserAction.class.php file, where user-supplied input through the _order parameter is not properly sanitized before being incorporated into SQL queries.

The flaw allows attackers to inject malicious SQL code that gets executed by the database backend. Since the vulnerability is remotely exploitable and requires no authentication, any attacker with network access to the affected EasyCMS installation can potentially exploit this weakness. The publicly available exploit increases the risk of widespread exploitation.

Root Cause

The root cause of this vulnerability is insufficient input validation and lack of proper sanitization of the _order argument in the UserAction.class.php file. The application fails to properly escape or parameterize user-controlled input before incorporating it into database queries, allowing SQL metacharacters to be interpreted as part of the SQL command structure rather than data.

Attack Vector

The attack vector is network-based, allowing remote exploitation without user interaction. An attacker can craft malicious HTTP requests targeting the vulnerable endpoint with a specially crafted _order parameter. The injected SQL code is then executed in the context of the database connection used by the application.

The vulnerability can be exploited by manipulating the _order parameter in requests to /UserAction.class.php. Attackers can inject SQL commands to extract sensitive data, modify database contents, or potentially escalate to operating system command execution depending on database configuration. Technical details and proof-of-concept information are available through the GitHub Issue Discussion and VulDB Entry.

Detection Methods for CVE-2026-1105

Indicators of Compromise

• Unusual SQL syntax or error messages in application logs referencing UserAction.class.php
• HTTP requests to /UserAction.class.php containing SQL keywords (SELECT, UNION, INSERT, DROP) in the _order parameter
• Database query logs showing anomalous ORDER BY clauses with unexpected syntax
• Increased database errors or timeouts potentially indicating blind SQL injection attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in the _order parameter
• Monitor HTTP access logs for requests to /UserAction.class.php with suspicious parameter values
• Deploy database activity monitoring to detect unusual query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) to alert on SQL injection signatures targeting PHP applications

Monitoring Recommendations

• Enable verbose logging for the EasyCMS application and database connections
• Set up alerts for database errors originating from the UserAction.class.php component
• Monitor for unauthorized database reads or modifications, particularly to user tables
• Review authentication and session logs for signs of account compromise following potential SQL injection

How to Mitigate CVE-2026-1105

Immediate Actions Required

• Restrict network access to the EasyCMS installation to trusted IP addresses only
• Implement a Web Application Firewall (WAF) with SQL injection protection enabled
• Consider temporarily disabling the affected functionality in /UserAction.class.php if possible
• Monitor logs closely for exploitation attempts while awaiting a patch

Patch Information

No official patch is currently available from the vendor. According to the disclosure, the vendor was contacted early about this vulnerability but did not respond. Organizations should monitor the VulDB entry and vendor announcements for any future security updates. Consider migrating to an alternative CMS solution if the vendor remains unresponsive.

Workarounds

• Apply input validation at the application layer to sanitize the _order parameter before processing
• Use parameterized queries or prepared statements if modifying the source code is feasible
• Deploy a reverse proxy with SQL injection filtering capabilities in front of the application
• Restrict database user privileges to limit the impact of successful SQL injection attacks

# Example WAF rule for ModSecurity to block SQL injection in _order parameter
# Add to modsecurity.conf or virtual host configuration
SecRule ARGS:_order "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in _order parameter - CVE-2026-1105',\
    tag:'application-multi',\
    tag:'language-multi',\
    tag:'platform-multi',\
    tag:'attack-sqli',\
    severity:'CRITICAL'"