CVE-2026-4561mediumCWE-79

CVE-2026-4561: medium-severity vulnerability in dvankooten MC4WP: Mailchimp for WordPress

MC4WP: Mailchimp for WordPress <= 4.12.0 - Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages

Published · Updated

Follow this CVE+ Monitor MC4WP: Mailchimp for WordPress

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.4epss 0.3%
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., 'text_subscribed', 'text_error') in all versions up to, and including, 4.12.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Affected products
dvankooten · MC4WP: Mailchimp for WordPress
Related CVEs — dvankooten MC4WP: Mailchimp for WordPress

In the same product, most dangerous first.

CVE-2024-8680MEDIUMMailChimp for Wordpress <= 4.9.16 - Authenticated (Administrator+) Stored Cross-Site ScriptingEPSS 0.5%CVE-2024-8850MEDIUMMC4WP: Mailchimp for WordPress 4.9.9 - 4.9.16 - Reflected Cross-Site ScriptingEPSS 0.5%CVE-2026-87917MEDIUMMC4WP: Mailchimp for WordPress <= 4.14.0 - Reflected Cross-Site Scripting via 'data' Dynamic Content TagEPSS 0.4%CVE-2026-1781MEDIUMMC4WP: Mailchimp for WordPress <= 4.11.1 - Missing Authorization to Unauthenticated Arbitrary Subscription DeletionEPSS 0.3%