What the vulnerability does
01Description
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 administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Explanation of Vulnerability in Simple Terms
02Summary
MC4WP: Mailchimp for WordPress versions up to 4.9.16 contain a cross-site scripting (XSS) vulnerability that allows high-privileged users to inject malicious scripts. The vulnerability has limited scope and requires high attack complexity. Site administrators should update to a version newer than 4.9.16 to mitigate this risk.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that affect site functionality and user data when executed by other administrators.
Potential impact on your site
04Site Impact
High-privilege user accounts could be compromised to inject malicious code affecting site operations and data.
Conditions required to exploit
05Prerequisites
Attacker must have high-level admin privileges and the attack requires specific technical conditions to succeed.
Key dates
06Disclosure timeline
September 21, 2024
CVE published
April 8, 2026
Record updated
