CVE Catalog

CVE-2026-6295

MediumCVSS 4.9
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.30%

23th percentile - higher than 23% of all known CVEs

Summary

The WP Optimizer plugin for WordPress in versions up to and including 2.5.0 is vulnerable to SQL Injection via the 's' parameter due to an unsafe subquery-detection branch in the Query::parse_key_compare_field() method. When the user-supplied value matches the regex ^[(\s]*SELECT\s+, it is wrapped in parentheses and embedded directly into the SQL string without escaping. Authenticated attackers with administrator-level access can inject arbitrary SQL subqueries, including time-based blind payloads, allowing extraction of sensitive information from the database.

Risk Assessment

An attacker with administrator privileges can exfiltrate sensitive data from the database, including user data and configuration. This can lead to a complete compromise of the site's security.

Recommendation

Update the WP Optimizer plugin to a version later than 2.5.0. Until then, limit the number of administrator accounts and monitor for unusual SQL queries.

Related vulnerabilities

Original NVD description (English source)

The WP Optimizer plugin for WordPress is vulnerable to SQL Injection via the 's' parameter in all versions up to and including 2.5.0. This is due to an unsafe subquery-detection branch in the Query::parse_key_compare_field() method that, when the user-supplied value matches the regex ^[(\s]*SELECT\s+, wraps the value in parentheses and embeds it directly into the SQL string without any escaping or quoting. While the normal LIKE code path correctly uses esc_sql($wpdb->esc_like(...)) and wraps the value in single quotes, this branch completely bypasses those protections. Because the attack payload (SELECT ...) contains no single quotes, WordPress's wp_magic_quotes() provides no protection. This makes it possible for authenticated attackers with administrator-level access to inject arbitrary SQL subqueries — including time-based blind payloads — that can be used to extract sensitive information from the database.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS