CVE-2021-4443

WordPress Mega Menu <= 2.0.6 - Arbitrary File Creation

9.8 Critical

The WordPress Mega Menu plugin for WordPress is vulnerable to Arbitrary File Creation in versions up to, and including, 2.0.6 via the compiler_save AJAX action. This makes it possible for unauthenticated attackers to create arbitrary PHP files that can be used to execute malicious code.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.67%Up 0.6 points since Oct 17, 2024

What each source reports

CVE List Score used 9.8

WordPress Mega Menu <= 2.0.6 - Arbitrary File Creation

Record: CVE-2021-4443
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

EUVDEUVD-2021-34628 9.8

Record: EUVD-2021-34628
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9crh-8h3q-mwwr 9.8

The WordPress Mega Menu plugin for WordPress is vulnerable to Arbitrary File Creation in versions...

Record: GHSA-9crh-8h3q-mwwr
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

NVD 9.8

Record: CVE-2021-4443
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-434
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-4443 is a critical vulnerability (CVSS 9.8) in Quadlayers Quadmenu – Mega Menu, published October 16, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. No source names a fixed version.