CVE-2026-3818: Tiandy Easy7 CMS SQL Injection Vulnerability

CVE-2026-3818 Overview

A SQL injection vulnerability has been discovered in Tiandy Easy7 CMS Windows version 7.17.0. The vulnerability exists in the file /Easy7/apps/WebService/GetDBData.jsp, where improper handling of the strTBName parameter allows remote attackers to inject malicious SQL commands. This flaw enables unauthorized database manipulation, potentially leading to data theft, modification, or deletion. The vulnerability can be exploited remotely without authentication, and proof-of-concept exploit details have been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to execute arbitrary SQL commands, potentially compromising database integrity, confidentiality, and availability of the affected content management system.

Affected Products

• Tiandy Easy7 CMS version 7.17.0 for Windows
• tiandy easy7_cms (CPE: cpe:2.3:a:tiandy:easy7_cms:7.17.0:*:*:*:*:windows:*:*)

Discovery Timeline

• 2026-03-09 - CVE-2026-3818 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-3818

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects the Tiandy Easy7 CMS content management system. The flaw is categorized under both CWE-89 (SQL Injection) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), indicating that user-supplied input is incorporated into SQL queries without proper sanitization or parameterization.

The vulnerable endpoint /Easy7/apps/WebService/GetDBData.jsp accepts the strTBName parameter, which appears to be used for specifying table names in database operations. Due to insufficient input validation, an attacker can inject SQL metacharacters and commands through this parameter, manipulating the intended query logic. The vulnerability is remotely exploitable via network access, requiring no authentication or user interaction.

Root Cause

The root cause of CVE-2026-3818 is improper input validation and the lack of parameterized queries in the GetDBData.jsp endpoint. The application directly concatenates user-supplied input from the strTBName parameter into SQL queries without proper sanitization, escaping, or use of prepared statements. This classic SQL injection pattern allows attackers to break out of the intended query context and inject their own SQL commands.

Attack Vector

The attack is initiated remotely over the network. An attacker can craft malicious HTTP requests to the vulnerable JSP endpoint, supplying specially crafted SQL syntax in the strTBName parameter. Since no authentication is required, any remote attacker with network access to the Tiandy Easy7 CMS installation can exploit this vulnerability.

The attack may allow adversaries to:

• Extract sensitive data from the database
• Modify or delete database records
• Potentially escalate privileges within the application
• In some configurations, execute system commands through database features

Proof-of-concept exploit information has been published, as documented in the VulDB advisory. The vendor was contacted about this disclosure but did not respond.

Detection Methods for CVE-2026-3818

Indicators of Compromise

• Unusual HTTP requests targeting /Easy7/apps/WebService/GetDBData.jsp with SQL metacharacters in the strTBName parameter
• Database log entries showing anomalous queries, error messages, or unexpected UNION, SELECT, or DROP statements
• Web server access logs containing URL-encoded SQL injection payloads (e.g., %27, %22, UNION, SELECT, --)
• Application errors or exceptions related to SQL syntax in database connections

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in requests to GetDBData.jsp
• Configure database auditing to log and alert on unusual query patterns, especially those involving dynamic table references
• Implement intrusion detection signatures for common SQL injection attack patterns in HTTP traffic
• Monitor for repeated requests to the vulnerable endpoint from the same source IP

Monitoring Recommendations

• Enable detailed logging on the Tiandy Easy7 CMS application server and review logs for suspicious activity
• Set up alerts for database errors or exceptions that may indicate exploitation attempts
• Monitor network traffic for unusual outbound connections from the database server that could indicate data exfiltration
• Regularly review web server access logs for patterns consistent with automated vulnerability scanning or exploitation

How to Mitigate CVE-2026-3818

Immediate Actions Required

• Restrict network access to the Tiandy Easy7 CMS installation using firewall rules, limiting exposure to trusted networks only
• Block access to the /Easy7/apps/WebService/GetDBData.jsp endpoint if it is not required for business operations
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules in front of the CMS
• Monitor systems for signs of exploitation and review database integrity

Patch Information

As of the last update on 2026-03-10, Tiandy has not responded to disclosure attempts or released an official security patch for CVE-2026-3818. Organizations should monitor the vendor's official channels for any future security updates. In the absence of a vendor patch, implementing the recommended workarounds and mitigations is critical to reducing risk.

Additional technical details are available via the VulDB entry and the associated technical documentation.

Workarounds

• Implement strict input validation at the application level to reject SQL metacharacters in the strTBName parameter
• Use network segmentation to isolate the CMS from untrusted networks and the public internet
• If feasible, disable or remove the GetDBData.jsp endpoint until a patch is available
• Apply database-level restrictions to limit the privileges of the application database account, reducing potential impact of successful exploitation

# Example: Block access to vulnerable endpoint using Apache mod_rewrite
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/Easy7/apps/WebService/GetDBData\.jsp [NC]
RewriteRule .* - [F,L]