CVE-2024-31378 in MailChimp Forms Plugin
Summary
by MITRE • 04/15/2024
Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailChimp Forms by MailMunch.This issue affects MailChimp Forms by MailMunch: from n/a through 3.2.1.
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Analysis
by VulDB Data Team • 04/06/2025
The Cross-Site Request Forgery vulnerability identified as CVE-2024-31378 resides within the MailMunch MailChimp Forms plugin, representing a critical security flaw that undermines the integrity of web applications relying on this component. This vulnerability specifically impacts versions of the plugin ranging from the initial release through version 3.2.1, creating a persistent risk for users who have not updated their installations. The flaw stems from the plugin's inadequate implementation of anti-CSRF protection mechanisms, which allows malicious actors to exploit user sessions and execute unauthorized actions without their knowledge or consent. The vulnerability operates by leveraging the trust relationship between the user's browser and the vulnerable application, enabling attackers to perform actions that should only be executable by authenticated users with proper authorization.
The technical nature of this CSRF vulnerability aligns with CWE-352, which defines Cross-Site Request Forgery as a condition where an attacker can induce users to perform actions they did not intend to execute. The flaw manifests when the plugin fails to validate the origin of requests or implement proper anti-CSRF tokens that would ensure requests originate from legitimate sources within the same origin. Attackers can craft malicious web pages or emails containing embedded requests that, when executed by authenticated users, trigger unwanted actions within the MailMunch plugin context. This includes potential modifications to form configurations, data manipulation, or unauthorized administrative actions that could compromise the entire MailChimp integration ecosystem. The vulnerability represents a fundamental breakdown in the principle of least privilege, where user sessions are not properly protected against unauthorized request manipulation.
The operational impact of CVE-2024-31378 extends beyond simple data exposure, as it creates opportunities for attackers to gain unauthorized access to critical marketing automation functionalities. Organizations using MailMunch MailChimp Forms may experience unauthorized form modifications, data leakage, or even complete compromise of their email marketing campaigns if attackers exploit this vulnerability. The attack surface is particularly concerning given that MailMunch plugin users often manage sensitive customer data and marketing assets through their MailChimp integrations. The vulnerability could enable attackers to modify form fields, redirect submissions to malicious endpoints, or manipulate campaign data, potentially leading to significant financial losses and reputational damage. Additionally, the persistent nature of the vulnerability across multiple versions means that organizations may have been exposed to attack for extended periods without awareness of the risk.
Security practitioners should prioritize immediate remediation of this vulnerability by updating to the latest available version of the MailMunch MailChimp Forms plugin, as this represents the most effective mitigation strategy. The ATT&CK framework categorizes this type of vulnerability under T1531, which involves establishing persistence and privilege escalation through web application attacks. Organizations should implement additional defensive measures including web application firewalls that can detect and block suspicious request patterns, monitoring for unauthorized configuration changes, and conducting regular security assessments of third-party plugins. Network segmentation and least privilege access controls should be enforced to limit the potential damage if exploitation occurs. The vulnerability also underscores the importance of maintaining comprehensive inventory of all web application components and their security status, as this type of flaw in third-party integrations can create unexpected attack vectors within otherwise secure environments. Regular security audits and vulnerability scanning should include thorough assessment of plugin security to prevent similar issues from remaining undetected for extended periods.