CVE-2026-4127 Missing authorization in Speedup Optimization
Authenticated subscribers can modify optimization settings due to missing authorization checks in the Speedup Optimization WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4127?
CVE-2026-4127 is a medium-severity missing authorization vulnerability in charlycharm Speedup Optimization, published on 21 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-4127?
How do I fix CVE-2026-4127?
No fix has been published for CVE-2026-4127 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4127 being exploited?
There is no known exploitation of CVE-2026-4127 in the wild and no public exploit code.
Sources
Also known as GHSA-r2gp-fxxq-xp2g.