CVE-2021-47909: Mult-E-Cart Ultimate SQL Injection Flaw

CVE-2021-47909 Overview

CVE-2021-47909 is a SQL injection vulnerability affecting Mult-E-Cart Ultimate version 2.4, a popular e-commerce platform. The vulnerability exists across multiple modules including inventory, customer, vendor, and order management components. Remote attackers who have obtained privileged vendor or admin roles can exploit the id parameter in various application endpoints to execute arbitrary SQL commands against the underlying database management system.

Critical Impact

Successful exploitation allows authenticated attackers with vendor or admin privileges to execute malicious SQL commands, potentially leading to complete database compromise, unauthorized data access, data manipulation, and extraction of sensitive customer and business information.

Affected Products

• Mult-E-Cart Ultimate 2.4

Discovery Timeline

• 2026-02-01 - CVE-2021-47909 published to NVD
• 2026-02-03 - Last updated in NVD database

Technical Details for CVE-2021-47909

Vulnerability Analysis

This vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The vulnerability allows authenticated users with elevated privileges to inject malicious SQL statements through the application's user interface.

The affected modules span core business functionality within the e-commerce platform, including inventory management, customer records, vendor administration, and order processing. Each of these modules accepts an id parameter that is not properly sanitized before being incorporated into SQL queries executed against the backend database.

The network-accessible nature of this vulnerability means attackers can exploit it remotely, though they must first obtain authenticated access with vendor or administrative privileges. Once exploited, attackers gain the ability to read, modify, or delete database contents, potentially compromising confidentiality and integrity of all stored data.

Root Cause

The root cause of CVE-2021-47909 is improper input validation and lack of parameterized queries in the Mult-E-Cart Ultimate application. The id parameter values received from user input are directly concatenated into SQL query strings without adequate sanitization or the use of prepared statements. This design flaw allows specially crafted input containing SQL syntax to be interpreted as executable commands by the database engine rather than as data values.

Attack Vector

The attack vector for this vulnerability is network-based, requiring the attacker to have authenticated access to the web application with vendor or admin-level privileges. The exploitation process involves:

1. The attacker authenticates to the Mult-E-Cart Ultimate application using valid vendor or admin credentials
2. The attacker navigates to one of the vulnerable modules (inventory, customer, vendor, or order management)
3. The attacker manipulates the id parameter in HTTP requests to include SQL injection payloads
4. The malicious SQL commands are executed against the database, allowing data extraction or manipulation

The vulnerability can be exploited through standard HTTP requests without requiring any specialized tools, making it relatively straightforward to attack once authentication is achieved. For detailed technical information about the exploitation methodology, refer to the Vulnerability Lab advisory #2306 and the VulnCheck SQL Injection Advisory.

Detection Methods for CVE-2021-47909

Indicators of Compromise

• Unusual SQL error messages appearing in application logs or error responses
• Database queries containing unexpected SQL syntax such as UNION SELECT, OR 1=1, or comment sequences (--, /**/)
• Anomalous access patterns to inventory, customer, vendor, or order modules by privileged accounts
• Evidence of bulk data extraction or unauthorized database dumps

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns targeting the id parameter
• Implement database activity monitoring to identify suspicious query patterns or unauthorized data access attempts
• Review application access logs for requests containing SQL injection signatures in URL parameters
• Enable audit logging on database systems to track unusual query execution from the application

Monitoring Recommendations

• Configure alerting for multiple failed or unusual database queries originating from the web application
• Monitor for privilege escalation attempts within the Mult-E-Cart application
• Implement real-time log analysis to detect SQL injection attack patterns
• Track and baseline normal database query volumes to identify potential data exfiltration

How to Mitigate CVE-2021-47909

Immediate Actions Required

• Review and restrict vendor and admin account access to minimize the attack surface
• Implement input validation on all id parameters at the application level
• Deploy WAF rules specifically targeting SQL injection attempts against the affected modules
• Audit existing privileged accounts for any signs of compromise or unauthorized access

Patch Information

At the time of publication, no vendor patch information is available in the CVE data. Organizations should monitor the Mult-E-Cart Ultimate official website for security updates and patches. Contact the vendor directly for guidance on remediation options and available fixes for version 2.4.

For additional security insights, refer to Techraft Security and the VulnCheck advisory.

Workarounds

• Implement parameterized queries or prepared statements at the application code level if source code access is available
• Use database stored procedures with strict input validation as an intermediary layer
• Restrict database user permissions for the application to minimum required privileges (principle of least privilege)
• Deploy network segmentation to limit database access from untrusted network zones
• Consider placing the application behind a reverse proxy with SQL injection filtering capabilities

# Example WAF rule for ModSecurity to block SQL injection in id parameters
SecRule ARGS:id "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in id parameter',\
    tag:'CVE-2021-47909'"