CVE-2026-4561: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in dvankooten MC4WP: Mailchimp for WordPress
Description
MC4WP: Mailchimp for WordPress plugin versions up to 4.12.0 are vulnerable to stored cross-site scripting (XSS) via insufficient sanitization of form response message post meta fields. Authenticated users with Author-level access or higher can inject malicious scripts that execute when other users view the affected pages. The vulnerability has a medium severity rating with a CVSS score of 6.4.
CVSS v3.1
Score 6.4medium
Affected software
dvankooten
MC4WP: Mailchimp for WordPress
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The MC4WP: Mailchimp for WordPress plugin suffers from a stored cross-site scripting vulnerability due to improper neutralization of input in form response message post meta fields such as 'text_subscribed' and 'text_error'. This allows authenticated attackers with Author-level privileges or higher to inject arbitrary JavaScript code that executes in the context of users visiting the injected pages. The issue affects all versions up to and including 4.12.0.
Potential Impact
An attacker with Author-level access or above can exploit this vulnerability to inject malicious scripts that execute in the browsers of users who visit the compromised pages. This can lead to information disclosure and limited integrity impact. The vulnerability does not affect availability. The CVSS 3.1 base score is 6.4 (medium severity).
Mitigation Recommendations
No explicit patch or remediation details are provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict Author-level access to trusted users and monitor for suspicious activity related to form response message fields.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-22T05:25:22.065Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a89a625acd9273b49149cbf
Added to database: 08/22/2026, 13:37:41 UTC
Last enriched: 09/11/2026, 02:02:45 UTC
Last updated: 10/06/2026, 18:48:22 UTC
Views: 52
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