Is CVE-2026-4127 actively exploited?

No active exploitation of CVE-2026-4127 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4127 be exploited remotely?

Yes. CVE-2026-4127 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4127?

CVE-2026-4127 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-4127

CWE-862Published: March 21, 2026· Updated: Mar 23, 2026

5.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.5th

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.

NVD Source

Technical Analysis

CVE-2026-4127 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.