How severe is CVE-2026-15052?

High severity. CVSS v3 base score is 7.2 out of 10.

XSS in Umarbajwa Mailchimp Subscribe Form, Optin Builder, Popup Form Builder

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 sanitiza…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Umarbajwa Mailchimp Subscribe Form, Optin Builder, Popup Form Builder — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-15052?: CVE-2026-15052 is a high-severity vulnerability in Umarbajwa Mailchimp Subscribe Form, Optin Builder, Popup Form Builder, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-08-01.
How severe is CVE-2026-15052?: High severity. CVSS v3 base score is 7.2 out of 10.