Threat intelligence

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

CVE-2026-4561 · mailchimp-for-wp

Important: Seeing this vulnerability listed does not mean your website is affected. Exposure depends on whether you run Mailchimp For Wp at a vulnerable version. How SiteRespond intelligence works

Vulnerability: MC4WP: Mailchimp for WordPress <= 4.12.0 - Authenticated (Author+) Stored Cross-Site Scripting via Form Response Messages
Affected software: mailchimp-for-wp(Plugin)
Affected versions: ≤ 4.12.0
Authentication: Authenticated (see advisory title)
Vulnerability type: Cross-site scripting
CVE: CVE-2026-4561
Published: 21 August 2026
CISA KEV: Not listed in CISA KEV at last catalog refresh
Impact: May allow attackers to run scripts in visitors' browsers or hijack admin sessions.
Source: Data imported from Wordfence Intelligence (advisory 641b739d-f888-4327-b1c5-c95de39ee011). Methodology and redistribution notes

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