CVE-2024-31378

MailChimp Forms by MailMunch <= 3.2.1 - Cross-Site Request Forgery

2024-04-10 00:00
Majed Refaea

Strategic Overview

Status
Patched in 3.2.2
Affected Plugin
Mailmunch Forms for Mailchimp
Affected Version
<= 3.2.1
CVSS
4.3Medium
Weakness type
CWE-352 · Cross-Site Request Forgery (CSRF)
CVE
CVE-2024-31378
View all Mailmunch Forms for Mailchimp vulnerabilities

At a glance

CVE-2024-31378 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Mailmunch Forms for Mailchimp WordPress plugin, affecting versions <= 3.2.1. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.2.2; sites on affected versions should update now. Disclosed April 2024, reported by Majed Refaea.

Vulnerability Overview

The MailChimp Forms by MailMunch plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.2.1. This is due to missing or incorrect nonce validation on the integrate case. This makes it possible for unauthenticated attackers to update the plugin's access token via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Mailmunch Forms for Mailchimp <= 3.2.1 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Mailmunch Forms for Mailchimp the fix is 3.2.2: builds <= 3.2.1 are affected, anything from 3.2.2 onward is not.

Remediation

Update to version 3.2.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Mailmunch Forms for Mailchimp: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Mailmunch Forms for Mailchimp 3.2.2 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-31378https://www.wordfence.com/threat-intel/vulnerabilities/id/7e069678-0c0a-4e4a-b0ee-404f488f9d01https://nvd.nist.gov/vuln/detail/CVE-2024-31378

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C