WordPress MC4WP: Mailchimp for WordPress plugin <= 4.14.0 - Reflected Cross-Site Scripting vulnerability

Reflected Cross-Site Scripting vulnerability discovered by nism0 in WordPress Plugin MC4WP versions = 4.14.0...

CVE-2026-87917

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'data' Dynamic Content Tag in all versions up to, and including, 4.14.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to...

EUVD-2026-83559

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'data' Dynamic Content Tag in all versions up to, and including, 4.14.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to...

CVE-2026-87917

The MC4WP: Mailchimp for WordPress plugin (versions up to and including 4.14.0 ) is vulnerable to Reflected Cross-Site Scripting (XSS) via the 'data' Dynamic Content Tag , caused by insufficient input sanitization and output escaping. An unauthenticated attacker can inject arbitrary web scripts i...

CVE-2026-87917: Improper Neutralization of Input During Web Page Generation

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'data' Dynamic Content Tag in all versions up to, and including, 4.14.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to...

PT-2026-95794

Name of the Vulnerable Software and Affected Versions MC4WP: Mailchimp for WordPress versions prior to 4.14.1 Description Insufficient input sanitization and output escaping in the data Dynamic Content Tag allow unauthenticated attackers to perform Reflected Cross-Site Scripting. This occurs when...

EUVD-2026-64299

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form response message post meta fields e.g., 'textsubscribed', 'texterror' in all versions up to, and including, 4.12.0 due to insufficient input sanitization and output escaping. This mak...

CVE-2026-4561: Improper Neutralization of Input During Web Page Generation

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the form response message post meta fields e.g., 'textsubscribed', 'texterror' in all versions up to, and including, 4.12.0 due to insufficient input sanitization and output escaping. This mak...

PT-2026-79552

Name of the Vulnerable Software and Affected Versions MC4WP: Mailchimp for WordPress versions prior to 4.12.1 Description Insufficient input sanitization and output escaping allow authenticated attackers with Author-level access and above to perform Stored Cross-Site Scripting. This is achieved b...

CVE-2026-1781: Missing Authorization

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 4.11.1. This is due to the plugin trusting the mc4wpaction POST parameter without validation, allowing unauthenticated attackers to force the form to process...

CVE-2024-9210: Improper Neutralization of Input During Web Page Generation

The MC4WP: Mailchimp Top Bar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of addqueryarg without appropriate escaping on the URL in all versions up to, and including, 1.6.0. This makes it possible for unauthenticated attackers to inject arbitrary web scripts...

PT-2024-39174

Name of the Vulnerable Software and Affected Versions: MC4WP: Mailchimp for WordPress plugin for WordPress versions up to, and including, 4.9.16 Description: The issue is related to Stored Cross-Site Scripting via admin settings due to insufficient input sanitization and output escaping. This...

CVE-2024-8680: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with...

CVE-2024-8850: Improper Neutralization of Input During Web Page Generation

The MC4WP: Mailchimp for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'email' parameter when a placeholder such as email is used for the field in versions 4.9.9 to 4.9.16 due to insufficient input sanitization and output escaping. This makes it possible f...