MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder < 1.2 — Remote Code Execution
680746a3-8a72-4ec2-9f58-d744f40168edPublished · Updated Action summary
Affected: <1.2Update to 1.2 or newer
All remediation steps- Severity
- High8.8
- CVSS
- 8.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder mailchimp-subscribe-sm
- Affected< 1.2
- Patched in1.2
Update to 1.2 or newer.
You are affected if you run < 1.2. Version 1.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 1.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to woodspeed.
The MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder theme for WordPress is vulnerable to Remote Code Execution in versions before 1.2 via the email field. This allows authenticated attackers to execute code on the server.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder
All 7| 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 |
- 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
Timeline
CVE published
Severity high, CVSS 8.8
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.