PT-2026-67058 · Umarbajwa · Mailchimp List Subscribe Form

She11F · CVE-2026-15052 · Published 2026-08-01 · Updated 2026-08-01

Telegram · Cvenotify

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

🚨 CVE-2026-15052 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.

🎖@cveNotify

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-15052

Affected Products

Mailchimp List Subscribe Form

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-15052 · Security Note
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3627272%40mailchimp-subscribe-sm&new=3627272%40mailchimp-subscribe-sm · Note
• https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/integrations/form-builder-database/extension.php#L179 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/c3d2425e-69e5-4efe-bbc6-0ef121e74341?source=cve · Note
• https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.php#L906 · Note
• https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/integrations/form-builder-database/extension.php#L127 · Note
• https://t.me/cveNotify/232358 · Telegram Post
• https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.php#L2311 · Note
• https://plugins.trac.wordpress.org/browser/mailchimp-subscribe-sm/tags/4.3.3/admin/classes/ajax-requests-class.php#L1224 · Note