MailChimp Subscribe Forms <= 4.0.9.3 - Open Redirect

6.1
URL Redirection to Untrusted Site ('Open Redirect')
CVE CVE-2023-32517
CVSS 6.1 (Medium)
Publicly Published May 10, 2023
Last Updated August 8, 2023
Researcher minhtuanact

Description

The MailChimp Subscribe Forms plugin for WordPress is vulnerable to Open Redirect in versions up to, and including, 4.0.9.3. This is due to the application failing to properly verify a user-supplied input parameter. This makes it possible for unauthenticated attackers to exploit this issue and redirect users to arbitrary web sites and conduct phishing attacks; other attacks are also possible.

References

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Vulnerability Details for MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder

Software Type Plugin
Software Slug mailchimp-subscribe-sm (view on wordpress.org)
Patched? Yes
Remediation Update to version 4.0.9.4, or a newer patched version
Affected Version
  • <= 4.0.9.3
Patched Version
  • 4.0.9.4

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

# Title CVE ID CVSS Researchers Date
1 MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting CVE-2026-27536 7.2 Nguyen Dinh Hai (HaiND) August 11, 2026
2 MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder <= 4.3.3 - Unauthenticated Stored Cross-Site Scripting via Form Field Values CVE-2026-15052 7.2 she11f July 31, 2026
3 MailChimp Subscribe Forms <= 4.1 - Authenticated (Contributor+) Stored Cross-Site Scripting CVE-2025-22727 6.4 Peter Thaleikis January 15, 2025
4 MailChimp Subscribe Forms <= 4.0.9.7 - Authenticated (Editor+) Stored Cross-Site Scripting CVE-2024-43211 4.4 Steven Julian August 9, 2024
5 MailChimp Subscribe Forms <= 4.0.9.1 - Authenticated (Administrator+) Stored Cross-Site Scripting CVE-2023-33328 4.4 Rio Darmawan May 22, 2023
6 MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder < 1.2 - Remote Code Execution 8.8 woodspeed April 21, 2015

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