CVE-2026-39441 Overview
CVE-2026-39441 is an unauthenticated SQL injection vulnerability in the Feed KuantoKusta for WooCommerce – Free WordPress plugin. The flaw affects all versions up to and including 5.3. Attackers can submit crafted input that the plugin passes into SQL queries without proper sanitization or parameterization. Because the attack requires no authentication, any remote user can target sites running the vulnerable plugin. The issue is classified under [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command). Patchstack documented the vulnerability and assigned it a high-impact rating reflecting unauthenticated network exploitation potential.
Critical Impact
Unauthenticated remote attackers can inject arbitrary SQL statements into the WordPress database, exposing sensitive data and impacting service availability.
Affected Products
- Feed KuantoKusta for WooCommerce – Free plugin versions <= 5.3
- WordPress installations with the affected plugin enabled
- WooCommerce stores integrating the KuantoKusta product feed
Discovery Timeline
- 2026-06-15 - CVE-2026-39441 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-39441
Vulnerability Analysis
The vulnerability is an unauthenticated SQL injection ([CWE-89]) in the Feed KuantoKusta for WooCommerce – Free plugin. The plugin accepts user-controlled input through one or more request parameters and concatenates that input into SQL queries executed against the WordPress database. Because the input is not validated or parameterized, attackers can break out of the intended query context and append arbitrary SQL clauses.
Successful exploitation allows attackers to read database contents such as user records, password hashes, session tokens, and WooCommerce order details. The CVSS vector indicates a scope change, meaning the impact extends beyond the vulnerable component to the broader database engine context. Confidentiality impact is high, while integrity is unaffected and availability impact is limited.
Root Cause
The root cause is improper neutralization of special elements in SQL statements. The plugin does not use prepared statements or the wpdb::prepare() API with proper placeholders before incorporating request data into queries. Untrusted input flows directly into query strings, enabling syntactic injection.
Attack Vector
The attack vector is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP request to a vulnerable plugin endpoint with malicious SQL payloads in parameters consumed by the plugin. The injected SQL is executed by the WordPress database backend, returning data or altering query logic. See the Patchstack Security Vulnerability Report for additional technical details.
Detection Methods for CVE-2026-39441
Indicators of Compromise
- Unexpected SQL syntax characters such as UNION, SELECT, --, ', or 0x appearing in HTTP request parameters targeting plugin endpoints
- Web server access logs showing repeated requests to Feed KuantoKusta plugin URLs with abnormally long or encoded query strings
- Database error messages or unusually long query execution times correlating with anonymous external requests
Detection Strategies
- Inspect WordPress and web server logs for requests to the plugin's public endpoints that contain SQL keywords or tautology patterns like OR 1=1
- Deploy a Web Application Firewall (WAF) rule set targeting SQL injection signatures on WooCommerce installations
- Correlate authentication-free requests with subsequent anomalous database query volumes through SIEM analytics
Monitoring Recommendations
- Enable verbose query logging on the WordPress database during incident triage to capture injection attempts
- Monitor outbound data transfer volumes from web servers hosting WooCommerce to identify possible exfiltration
- Alert on access to sensitive tables such as wp_users and wp_usermeta outside expected administrative workflows
How to Mitigate CVE-2026-39441
Immediate Actions Required
- Disable or remove the Feed KuantoKusta for WooCommerce – Free plugin until a fixed version is installed
- Apply WAF rules that block SQL injection patterns against the plugin's request endpoints
- Audit WordPress user accounts and rotate administrator credentials if exploitation is suspected
Patch Information
At the time of publication, the Patchstack Security Vulnerability Report documents the issue in versions <= 5.3. Site operators should upgrade to a vendor-released version higher than 5.3 once available and verify the plugin changelog confirms the SQL injection fix.
Workarounds
- Restrict access to the plugin's endpoints at the reverse proxy or WAF layer until a patched version is deployed
- Run least-privilege database accounts for WordPress so injected queries cannot access tables outside the WordPress schema
- Enforce regular backups of the WordPress database to enable rapid restoration if compromise is detected
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
