Vulnerability Description
The MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Form Field Values in all versions up to, and including, 4.3.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/adm
- https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/adm
- https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/adm
- https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/int
- https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/int
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3627272%40mailchimp-s
- https://www.wordfence.com/threat-intel/vulnerabilities/id/c3d2425e-69e5-4efe-bbc
FAQ
What is CVE-2026-15052?
CVE-2026-15052 is a vulnerability with a CVSS score of 7.2 (HIGH). The MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Form Field Values in all versions up to, and including, 4...
How severe is CVE-2026-15052?
CVE-2026-15052 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-15052?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.