Reported vulnerability
WP Optimizer <= 2.5.0 - Authenticated (Administrator+) SQL Injection via 's' Parameter
Published 18 Sept 2026
Updated 19 Sept 2026
CVE-2026-6295
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Does this affect my version?
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Wordfence advisory
medium · CVSS 4.9The 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.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
WP Optimizer – PageSpeed, Cache, Minify & Core Web Vitals
- Software
- plugin · wp-optimizer
- Affected versions
- Start version unspecified, through 2.5.0
- Fix availability
- Fix available
- Fixed versions
- 2.6.0
Recommended action
Update to version 2.6.0, or a newer patched version
Further references (1)
Data sources and licences
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Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
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Get help with this issueQuestions about this vulnerability
Which versions of WP Optimizer – PageSpeed, Cache, Minify & Core Web Vitals are affected?
Wordfence lists these affected versions: Start version unspecified, through 2.5.0. Use the version checker above to compare your installed release with this report.
Is a fix available for WP Optimizer – PageSpeed, Cache, Minify & Core Web Vitals?
Wordfence reports a fix for this issue in WP Optimizer – PageSpeed, Cache, Minify & Core Web Vitals. It lists these fixed versions: 2.6.0. Back up your website and test the recommended update before applying it to your live site.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.
Other reports for the same product
These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.