CVE-2019-25753: Joomla VMap 1.9.6 SQL Injection Vulnerability – Unauthenticated Database Access Risk

Technical summary

CVE-2019-25753 is an unauthenticated SQL injection vulnerability (CWE-89) in the VMap component for Joomla. The vulnerability exists in the map marker loading functionality, where user-supplied input from the latlngbound parameter is not properly sanitized before being passed to SQL query construction. An attacker can send requests to index.php with option=com_vmap&task=loadmarker alongside malicious SQL payloads to execute arbitrary queries. The attack vector is network-based with low complexity and no privilege or user interaction requirements, resulting in a CVSS 3.1 score of 8.2 (HIGH severity). The vulnerability provides high confidentiality impact but limited integrity impact, and no availability impact.

Business impact

Exploitation of this vulnerability could result in unauthorized disclosure of sensitive business and user data stored in your Joomla database, including customer information, credentials, and internal records. The attacker does not need valid credentials or special system access, making it a significant exposure risk for any publicly accessible Joomla installation running the vulnerable VMap component. Data breaches could trigger regulatory compliance violations, reputational damage, and incident response costs.

Affected systems

The vulnerability specifically affects Joomla! Component VMap version 1.9.6. Any Joomla installation with this component version installed and exposed to network traffic is at risk. The attack does not require the attacker to be authenticated or have special privileges, so all internet-facing instances are potentially vulnerable.

Exploitability

This vulnerability is relatively straightforward to exploit. An attacker only needs to craft a malicious HTTP GET request containing SQL injection payloads in the latlngbound parameter. No authentication, no complex social engineering, and no user interaction is required. The low attack complexity and network accessibility make this a high-risk vulnerability from an exploitability standpoint. However, the vulnerability is not currently tracked in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Remediation

Immediately update Joomla! Component VMap to a patched version that addresses the SQL injection vulnerability. Verify the specific patch version from the official VMap component changelog or the Joomla Extension Directory. If an immediate patch is unavailable, consider disabling the VMap component in your Joomla administration panel until a fix is available. Additionally, review your database access logs and perform forensic analysis to determine if the vulnerability has been exploited.

Patch guidance

Contact the VMap component maintainer or check the official Joomla Extension Directory for an updated version that remediates SQL injection in the latlngbound parameter handling. Apply the patch during a scheduled maintenance window after backing up your Joomla database and configuration files. Test the update in a staging environment to ensure compatibility with your Joomla version and other installed components before deploying to production. Verify against the vendor advisory to confirm the specific patched version number.

Detection guidance

Monitor your web server access logs for suspicious GET requests to index.php containing option=com_vmap&task=loadmarker parameters with encoded SQL syntax (e.g., UNION, SELECT, OR 1=1). Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in URL parameters. Query your database logs for unusual query patterns or access to sensitive tables that coincide with the request timestamps. Use intrusion detection systems (IDS) configured to identify SQL injection attacks at the network level.

Why prioritize this

Prioritize this vulnerability as HIGH urgency. The combination of high CVSS score (8.2), unauthenticated access, network exposure, and straightforward exploitability makes it a critical risk for any Joomla instance running VMap 1.9.6. The potential for data exfiltration and the lack of required authentication or user interaction elevate this significantly above lower-risk vulnerabilities. Patching should proceed immediately after testing.

Risk score, explained

The CVSS 3.1 score of 8.2 reflects a HIGH severity vulnerability due to: network-based attack vector requiring no authentication or privilege escalation, low attack complexity, high confidentiality impact (attackers can extract database contents), and the SQL injection footprint that enables database manipulation. The score is not at critical (9.0+) because the integrity and availability impacts are limited—the vulnerability allows data exfiltration and limited modification, but not system-wide outage.

Frequently asked questions