CVE-2021-36833 MEDIUM

CVE-2021-36833: WordPress MC4WP plugin <= 4.8.6 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability

Vendor Ibericode
Product MC4WP: Mailchimp for WordPress
Weakness CWE-79 · XSS
Published May 20, 2022
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

4.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

Authenticated (admin or higher user role) Stored Cross-Site Scripting (XSS) vulnerability in ibericode's MC4WP plugin <= 4.8.6 at WordPress.

Explanation of Vulnerability in Simple Terms

02Summary

MC4WP: Mailchimp for WordPress versions up to 4.8.6 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with high privileges can inject malicious scripts that execute in the browsers of other site visitors. The vulnerability requires user interaction to trigger and affects the plugin's admin interface. Site owners should update to a version newer than 4.8.6.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers when they view affected plugin pages.

Potential impact on your site

04Site Impact

Admins or other high-privilege users could be compromised if they visit a page containing injected malicious code.

Conditions required to exploit

05Prerequisites

Attacker must have high-level admin privileges and a victim must visit the affected admin page.

Key dates

06Disclosure timeline

May 20, 2022 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-65762 Joomla Extension - phoca.cz - Reflected XSS vulnerability in Phoca Guestbook 5.0.0-6.1.0 CVE-2026-65447 WordPress Contest Gallery plugin <= 30.0.6 - Cross Site Scripting (XSS) vulnerability CVE-2026-15730 GamiPress <= 7.9.9.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'heading_size' Shortcode Attribute CVE-2026-65446 WordPress Kali Forms plugin <= 2.4.18 - Cross Site Scripting (XSS) vulnerability CVE-2026-15665 Fluent Support <= 2.3.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'redirect-to' Shortcode Attribute