WordPress plugin
MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder security & vulnerabilities
No known unpatched vulnerabilities in the latest version
All 7 known vulnerabilities are fixed in the latest release. If you run an older version, update to null or newer.
- Critical0
- High3
- Medium4
- Low0
All MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder vulnerabilities
| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤4.3.3Update to 4.3.4 | CVE-2026-27536 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Form Field Values ≤4.3.3Update to 4.3.4 | CVE-2026-15052 | |
| Medium6.4 | Authenticated (Contributor+) Stored Cross-Site Scripting ≤4.1Update to 4.2 | CVE-2025-22727 | |
| Medium4.4 | Authenticated (Editor+) Stored Cross-Site Scripting ≤4.0.9.7Update to 4.0.9.8 | CVE-2024-43211 | |
| Medium4.4 | Authenticated (Administrator+) Stored Cross-Site Scripting ≤4.0.9.1Update to 4.0.9.2 | CVE-2023-33328 | |
| Medium6.1 | Open Redirect ≤4.0.9.3Update to 4.0.9.4 | CVE-2023-32517 | |
| High8.8 | Remote Code Execution <1.2Update to 1.2 | — |
- High7.2Unauthenticated Stored Cross-Site Scripting
≤4.3.3Update to 4.3.4
- High7.2Unauthenticated Stored Cross-Site Scripting via Form Field Values
≤4.3.3Update to 4.3.4
- Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤4.1Update to 4.2
- Medium4.4Authenticated (Editor+) Stored Cross-Site Scripting
≤4.0.9.7Update to 4.0.9.8
- Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting
≤4.0.9.1Update to 4.0.9.2
- Medium6.1Open Redirect
≤4.0.9.3Update to 4.0.9.4
- High8.8Remote Code Execution
<1.2Update to 1.2
MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder: common questions
Does MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder have known vulnerabilities?
Yes. VulnCrest Radar lists 7 known vulnerabilities in MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder: 3 high, 4 medium. None are known to affect version null.
How do I check which version of MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder I run?
In wp-admin open Plugins → Installed Plugins; the version is shown under the name. Without admin access, our passive Check my site tool can often read it from public files.
What is the most recent MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder vulnerability?
CVE-2026-27536, published Aug 11, 2026: MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting. Severity: High (CVSS 7.2).
Is any MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder vulnerability listed in CISA KEV?
No. None of the known MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder vulnerabilities is currently listed in the CISA KEV catalog.