CVE-2026-4127

| EUVD-2026-13995 MEDIUM
2026-03-21 Wordfence GHSA-r2gp-fxxq-xp2g
4.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 21, 2026 - 04:00 vuln.today
EUVD ID Assigned
Mar 21, 2026 - 04:00 euvd
EUVD-2026-13995
CVE Published
Mar 21, 2026 - 03:26 nvd
MEDIUM 4.3

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.

Analysis

The Speedup Optimization plugin for WordPress contains a missing authorization vulnerability in the `speedup01_ajax_enabled()` AJAX handler that fails to verify user capabilities or nonce tokens, allowing authenticated attackers with Subscriber-level privileges to enable or disable the site's optimization module. Affected versions include all releases up to and including 1.5.9, as documented by Wordfence. …

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Remediation

Within 30 days: Identify affected systems running for WordPress is vulnerable to Missing Authorization in all and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +22
POC: 0

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CVE-2026-4127 vulnerability details – vuln.today

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