CVE-2026-4127
The Speedup Optimization plugin for WordPress is vulnerable to Missing Authorization in all versions up to and including 1.5.9.
Does this matter?
Lower severity and a low EPSS score (0.21%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.21% probability · 11th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-862
- Source
- security@wordfence.com
References
- https://plugins.trac.wordpress.org/browser/speedup-optimization/tags/1.5.9/speedup-optimization.php#L172
- https://plugins.trac.wordpress.org/browser/speedup-optimization/tags/1.5.9/speedup-optimization.php#L178
- https://plugins.trac.wordpress.org/browser/speedup-optimization/trunk/speedup-optimization.php#L172
- https://plugins.trac.wordpress.org/browser/speedup-optimization/trunk/speedup-optimization.php#L178
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3f37c650-af0d-4474-9c1b-7f8d361b4d81?source=cve
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.