Stored Cross-Site Scripting Vulnerability in Mailchimp for WordPress Plugin
CVE-2026-4561

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Mc4WP: Mailchimp For WordPress
Vendor
CVE Published:
22 August 2026

What is CVE-2026-4561?

The Mailchimp for WordPress plugin is exposed to a Stored Cross-Site Scripting vulnerability due to insufficient input sanitization and output escaping in the form response message post meta fields, such as 'text_subscribed' and 'text_error'. This flaw permits authenticated users with Author-level access or higher to insert arbitrary web scripts into pages. These scripts could execute whenever a user visits an affected page, thereby compromising the integrity of the website and the safety of its visitors.

Affected Version(s)

MC4WP: Mailchimp for WordPress 0 <= 4.12.0

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/mailchimp-for-...
https://plugins.trac.wordpress.org/browser/mailchimp-for-...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Osvaldo Noe Gonzalez Del Rio (Os)
.