CVE-2026-2503 is a time-based SQL Injection vulnerability affecting the ElementCamp plugin for WordPress, specifically in versions up to and including 2.3.6. The flaw exists in the handling of the 'meta_query[compare]' parameter within the 'tcg_select2_search_post' AJAX action. This parameter is intended to specify a comparison operator for meta queries but is not validated against an allowlist of safe SQL operators. Instead, the user-supplied value is passed through esc_sql(), which only escapes quotes and certain characters but does not prevent injection when the payload is used as an operator outside of quotes. As a result, authenticated users with Author-level or higher privileges can inject additional SQL commands by manipulating this parameter, enabling them to extract sensitive information from the WordPress database. The vulnerability does not require user interaction and can be exploited remotely over the network. Although no public exploits have been reported yet, the vulnerability's nature allows attackers to perform unauthorized data retrieval, impacting confidentiality. The vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The CVSS v3.1 base score is 6.5, reflecting medium severity with network attack vector, low attack complexity, and requiring privileges but no user interaction. No official patches have been linked yet, so mitigation involves implementing strict validation of the 'meta_query[compare]' parameter to allow only known safe SQL operators and restricting access to trusted users. Given WordPress's widespread use globally, this vulnerability could affect many websites that use the ElementCamp plugin without proper updates or mitigations.

The primary impact of CVE-2026-2503 is unauthorized disclosure of sensitive information stored in the WordPress database. Attackers with Author-level access can exploit this vulnerability to perform time-based SQL Injection attacks, enabling them to extract data such as user credentials, personal information, or site configuration details. While the vulnerability does not allow direct modification or deletion of data (no integrity or availability impact), the confidentiality breach can facilitate further attacks, including privilege escalation or site takeover. Organizations relying on the ElementCamp plugin for content management or e-commerce may face data leaks, reputational damage, and compliance violations. The ease of exploitation (low complexity) combined with network accessibility increases the risk, especially for sites with multiple authors or contributors. Since the vulnerability requires authenticated access, the threat is somewhat limited to insiders or compromised accounts but remains significant for multi-user environments. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for future attacks once exploit code becomes available.

To mitigate CVE-2026-2503, organizations should first check for and apply any official patches or updates from the ElementCamp plugin developers as soon as they become available. In the absence of patches, implement strict server-side validation for the 'meta_query[compare]' parameter by enforcing an allowlist of permitted SQL comparison operators (e.g., '=', '!=', '<', '>', '<=', '>='). Avoid relying solely on esc_sql() for sanitization of operator inputs. Limit the number of users with Author-level or higher privileges to reduce the attack surface and monitor their activities closely. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious SQL injection patterns targeting the vulnerable AJAX action. Regularly audit WordPress user accounts and permissions to ensure no unauthorized elevation of privileges. Additionally, consider disabling or restricting the vulnerable AJAX endpoint if it is not essential for site functionality. Maintain comprehensive logging and alerting to detect anomalous database queries or access patterns indicative of exploitation attempts. Finally, educate site administrators and developers about secure coding practices and the risks of improper input validation in WordPress plugins.