Is CVE-2026-15052 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15052?

CVE-2026-15052 has a CVSS v3 severity of HIGH (7.2).

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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.