High severity7.2NVD Advisory· Published Aug 1, 2026· Updated Aug 12, 2026
CVE-2026-15052
CVE-2026-15052
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=4.3.3
Patches
Vulnerability mechanics
References
7- plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.phpnvd
- plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.phpnvd
- plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.phpnvd
- plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/integrations/form-builder-database/extension.phpnvd
- plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/integrations/form-builder-database/extension.phpnvd
- plugins.trac.wordpress.org/changesetnvd
- www.wordfence.com/threat-intel/vulnerabilities/id/c3d2425e-69e5-4efe-bbc6-0ef121e74341nvd
News mentions
2- Wordfence Intelligence Weekly WordPress Vulnerability Report (August 3, 2026 to August 9, 2026)Wordfence Blog · Aug 14, 2026
- Wordfence Intelligence Weekly WordPress Vulnerability Report (July 27, 2026 to August 2, 2026)Wordfence Blog · Aug 8, 2026