CVE-2026-4127
Received Received - Intake
Missing Authorization in WordPress Speedup Plugin Enables Privilege Abuse

Publication date: 2026-03-21

Last updated on: 2026-04-08

Assigner: Wordfence

Description
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.
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Meta Information
Published
2026-03-21
Last Modified
2026-04-08
Generated
2026-06-16
AI Q&A
2026-03-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4127
EUVD
EUVD-2026-13995
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
speedup_optimization plugin to 1.5.9 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
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Executive Summary

The Speedup Optimization plugin for WordPress has a vulnerability called Missing Authorization in all versions up to and including 1.5.9. Specifically, the function speedup01_ajax_enabled(), which handles an AJAX action, does not check if the user has the proper permissions or verify a security nonce. This means that any authenticated user with Subscriber-level access or higher can send a POST request to enable or disable the site's optimization module without proper authorization.

Impact Analysis

This vulnerability allows authenticated users with low-level access (Subscriber or above) to enable or disable the site's optimization module without proper permission checks. This could lead to unauthorized changes in site performance or behavior, potentially disrupting the site's functionality or degrading user experience.

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