charlycharm Speedup Optimization Plugin up to 1.5.9 on WordPress AJAX speedup01_ajax_enabled authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in charlycharm Speedup Optimization Plugin up to 1.5.9 on WordPress. The affected element is the function speedup01_ajax_enabled of the component AJAX Handler. The manipulation results in authorization. This vulnerability was named CVE-2026-4127. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in charlycharm Speedup Optimization Plugin up to 1.5.9 on WordPress. It has been classified as critical. Affected is the function speedup01_ajax_enabled of the component AJAX Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9. The `speedup01_ajax_enabled()` function, which handles the `wp_ajax_speedup01_enabled` AJAX action, does not perform any capability check via `current_user_can()` and also lacks nonce verification. This is in contrast to other AJAX handlers in the same plugin (e.g., `speedup01_ajax_install_iox` and `speedup01_ajax_delete_cache_file`) which properly check for `install_plugins` and `manage_options` capabilities respectively. This makes it possible for authenticated attackers, with Subscriber-level access and above, to enable or disable the site's optimization module by sending a POST request to admin-ajax.

The weakness was presented by Nabil Irawan. The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-4127 since 03/13/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.5.9 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• charlycharm

Name

• Speedup Optimization Plugin

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9

CPE 2.3info

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CPE 2.2info

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