MailChimp Forms by MailMunch <= 3.2.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2024-29793
CVSS 6.4 (Medium)
Publicly Published March 25, 2024
Last Updated April 1, 2024
Researcher Ngô Thiên An (ancorn_)

Description

The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode in all versions up to, and including, 3.2.2 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

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Vulnerability Details for Mailmunch Forms for Mailchimp

Software Type Plugin
Software Slug mailchimp-forms-by-mailmunch (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.2.3, or a newer patched version
Affected Version
  • <= 3.2.2
Patched Version
  • 3.2.3

Recent vulnerabilities in Mailmunch Forms for Mailchimp

# Title CVE ID CVSS Researchers Date
1 MailChimp Forms by MailMunch <= 3.2.7 - Missing Authorization to Authenticated (Subscriber+) MailMunch Integration Takeover via 'sign_in' AJAX Action CVE-2026-7520 8.1 t0ann9uy3n August 4, 2026
2 MailChimp Forms by MailMunch <= 3.2.3 - Reflected Cross-Site Scripting CVE-2024-8726 6.1 vgo0 November 19, 2024
3 MailChimp Forms by MailMunch <= 3.2.1 - Cross-Site Request Forgery CVE-2024-31378 4.3 Majed Refaea April 10, 2024
4 MailChimp Forms by MailMunch <= 3.1.7 - Cross-Site Request Forgery via Multiple AJAX actions CVE-2023-45748 5.4 Abdi Pranata October 12, 2023
5 MailChimp Forms by MailMunch <= 3.1.4 - Missing Authorization via multiple AJAX actions CVE-2023-40203 5.4 István Márton August 11, 2023

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