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CVE-2024-9210: MC4WP: Mailchimp Top Bar <= 1.6.0 - Reflected Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-02 · updated 2026-06-17
• Weakness: CWE-79

Description

The MC4WP: Mailchimp Top Bar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg 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 in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected products

• dvankooten MC4WP: Mailchimp Top Bar: before 1.6.1 — fixed in 1.6.1

How to fix

Upgrade to a fixed version: dvankooten MC4WP: Mailchimp Top Bar 1.6.1. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/mailchimp-top-bar/tags/1.6.0/views/settings-page.php#L40
• https://plugins.trac.wordpress.org/browser/mailchimp-top-bar/tags/1.6.1/views/settings-page.php#L40
• https://www.wordfence.com/threat-intel/vulnerabilities/id/b45ba98f-4cd1-406a-8661-e19d5b4c3ba8?source=cve

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