CVE-2023-32517: WordPress MailChimp Subscribe Forms Plugin <= 4.0.9.3 is vulnerable to Open Redirection

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-29 · updated 2026-06-17
Weakness: CWE-601

Description

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in PluginOps MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder.This issue affects MailChimp Subscribe Form, Optin Builder, PopUp Builder, Form Builder: from n/a through 4.0.9.3.

Affected products

dvankooten MC4WP: Mailchimp for WordPress: before 4.0.9.4 — fixed in 4.0.9.4

How to fix

Upgrade to a fixed version: dvankooten MC4WP: Mailchimp for WordPress 4.0.9.4. Check the vendor advisory for mitigations.

References

https://patchstack.com/database/vulnerability/mailchimp-subscribe-sm/wordpress-mailchimp-subscribe-forms-plugin-4-0-9-1-open-redirection-vulnerability?_s_id=cve
https://patchstack.com/database/vulnerability/mailchimp-subscribe-sm/wordpress-mailchimp-subscribe-forms-plugin-4-0-9-1-open-redirection-vulnerability?_s_id=cve

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