WP Vulnerability WatchVulnerability data as of September 7, 2026

Known vulnerabilities in MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder

MailChimp Subscribe Form allows you to create Beautiful Professional looking Subscribe Forms, Popups, bars & full page optins easily in less than …

7Reported vulnerabilities
8.8Highest CVSS score
4.3.4Latest version
2,000+Active installs

What to do now

Update MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder to 4.3.4 or later. 7 of these have a fixed version available. Updating resolves them.

Plugin last updated: July 29, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVESeverityExploit probability
next 30 days		 Affected versionsFixed inPublished
WF-680746a3-8a72-4ec2-9f58-d744f40168ed High 8.8 — Before 1.2 1.2 April 21, 2015
CVE-2026-15052 High 7.2 0.3% 0 to 4.3.3 (inclusive) 4.3.4 August 1, 2026
CVE-2026-27536 High 7.2 0.2% 4.3.3 and earlier 4.3.4 August 11, 2026
CVE-2025-22727 Medium 6.4 0.2% 4.1 and earlier 4.2 January 15, 2025
CVE-2023-32517 Medium 6.1 0.4% 4.0.9.3 and earlier 4.0.9.4 May 10, 2023
CVE-2024-43211 Medium 4.4 0.3% 4.0.9.7 and earlier 4.0.9.8 August 9, 2024
CVE-2023-33328 Medium 4.4 0.4% 4.0.9.1 and earlier 4.0.9.2 May 22, 2023

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.