CVE-2026-4662 is a critical SQL Injection vulnerability found in the Crocoblock JetEngine plugin for WordPress, specifically affecting all versions up to and including 3.8.6.1. The vulnerability stems from the `listing_load_more` AJAX action, which processes the `filtered_query` parameter without including it in the HMAC signature validation. This omission allows attackers to inject malicious SQL fragments by bypassing the security checks designed to validate input integrity. The root cause lies in the `prepare_where_clause()` method of the SQL Query Builder, which fails to sanitize the `compare` operator before concatenating it into SQL statements. Consequently, attackers can append arbitrary SQL commands to existing queries. Since the vulnerability is exploitable without authentication or user interaction, any WordPress site using JetEngine with Listing Grid and Load More enabled that relies on SQL Query Builder queries is at risk. The attack can lead to unauthorized data disclosure by extracting sensitive information from the backend database. Although no public exploits have been reported yet, the ease of exploitation and the high impact on confidentiality make this a significant threat. The CVSS 3.1 base score of 7.5 reflects the network attack vector, low attack complexity, no privileges required, no user interaction, and high confidentiality impact but no integrity or availability impact.

The primary impact of CVE-2026-4662 is unauthorized disclosure of sensitive data from the backend database of affected WordPress sites. Attackers can exploit this vulnerability remotely without authentication or user interaction, making it highly accessible. Data leakage can include user credentials, personal information, business data, or other confidential content stored in the database. This can lead to privacy violations, regulatory non-compliance, reputational damage, and potential further attacks leveraging stolen data. Since the vulnerability does not affect data integrity or availability, it is less likely to cause service disruption but remains critical due to confidentiality breaches. Organizations relying on JetEngine for dynamic content loading with SQL Query Builder queries are particularly vulnerable. The widespread use of WordPress and JetEngine in various sectors including e-commerce, publishing, and corporate websites means the threat has broad potential impact globally. Attackers could also use extracted data to pivot into deeper network compromise or targeted attacks.

To mitigate CVE-2026-4662, organizations should immediately update the JetEngine plugin to a patched version once released by Crocoblock. Until a patch is available, administrators should disable the 'Load More' feature on JetEngine Listing Grids that use SQL Query Builder queries to prevent exploitation. Additionally, implementing Web Application Firewall (WAF) rules to detect and block suspicious SQL injection patterns targeting the `listing_load_more` AJAX endpoint can reduce risk. Reviewing and restricting access to AJAX endpoints via server configuration or plugin settings can limit exposure. Site owners should audit their use of the `filtered_query` parameter and avoid using unsanitized dynamic SQL queries. Employing database activity monitoring to detect anomalous query patterns may help identify exploitation attempts. Regular backups and monitoring logs for unusual access patterns are recommended. Finally, educating developers to avoid concatenating unsanitized input in SQL queries and to use parameterized queries or prepared statements is critical for long-term security.