CVE-2024-8870 Mailchimp

 CVE-2024-8870 Mailchimp

CVE-2024-8870 is a Reflected Cross-Site Scripting (XSS) vulnerability found in the "Forms for Mailchimp by Optin Cat – Grow Your MailChimp List" plugin for WordPress. This vulnerability affects all versions up to and including 2.5.6. The issue arises from the improper handling of user input through the add_query_arg function, which does not escape URLs appropriately. This oversight allows unauthenticated attackers to inject arbitrary web scripts into web pages, which can execute if a user is tricked into clicking a malicious link.

Technical Details

Vulnerability Description

The vulnerability is classified as medium severity with a CVSS score of 6.1. The exploitation of this vulnerability can lead to significant security risks, including:

• Arbitrary Script Injection: Attackers can inject malicious scripts that execute in the context of the user's browser session.
• User Interaction Requirement: Successful exploitation typically requires social engineering tactics to convince users to click on a crafted link.

Affected Component

The affected component is the "Forms for Mailchimp" plugin, which is widely used for integrating Mailchimp services into WordPress sites. The vulnerability exists due to:

• Use of add_query_arg without Escaping: This function is intended to safely add query parameters to URLs. However, when user input is not properly sanitized, it opens the door for XSS attacks.

Example of Exploitation

An attacker could craft a URL that includes a malicious script as part of the query parameters. For instance:

text
https://example.com/path/to/plugin?param=<script>alert('XSS');</script>

If an unsuspecting user clicks this link while logged into their WordPress account, the script would execute in their browser, potentially leading to data theft or unauthorized actions performed on behalf of the user.

Mitigation Strategies

To mitigate this vulnerability, users and administrators should consider the following actions:

1. Update Plugin: Ensure that the "Forms for Mailchimp by Optin Cat" plugin is updated to a version that addresses this vulnerability (post 2.5.6).
2. Input Sanitization: Implement additional input sanitization measures in custom implementations or themes that utilize this plugin.
3. User Education: Educate users about the risks of clicking unknown or suspicious links, particularly those that appear to come from trusted sources.

Conclusion

CVE-2024-8870 highlights the importance of secure coding practices, particularly in web applications where user input is involved. The vulnerability's potential for exploitation underscores the need for timely updates and vigilant security measures within WordPress environments. As with any security flaw, prompt action can significantly reduce the risk of exploitation and protect both site administrators and users from potential threats.