CVE-2019-11843 : Security Advisory and Response

The MailPoet plugin for WordPress, version 3.23.2 and earlier, has a vulnerability that allows remote attackers to insert unauthorized web script or HTML onto a website by utilizing additional parameters within the URL. This vulnerability is known as Reflective Server-Side XSS.

Understanding CVE-2019-11843

This CVE entry describes a security issue in the MailPoet plugin for WordPress that could be exploited by attackers to inject malicious scripts or HTML code into a website.

What is CVE-2019-11843?

The vulnerability in the MailPoet plugin for WordPress, versions 3.23.2 and earlier, enables remote attackers to execute Reflective Server-Side XSS attacks by manipulating URL parameters.

The Impact of CVE-2019-11843

This vulnerability could lead to unauthorized script or HTML injection on affected websites, potentially compromising user data and website integrity.

Technical Details of CVE-2019-11843

The technical aspects of the CVE-2019-11843 vulnerability are as follows:

Vulnerability Description

The MailPoet plugin before version 3.23.2 for WordPress allows remote attackers to inject arbitrary web script or HTML using extra parameters in the URL (Reflective Server-Side XSS).

Affected Systems and Versions

Product: MailPoet plugin for WordPress
Versions affected: 3.23.2 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating additional parameters within the URL to inject unauthorized web script or HTML onto a website.

Mitigation and Prevention

Protecting systems from CVE-2019-11843 requires immediate actions and long-term security practices:

Immediate Steps to Take

Update the MailPoet plugin to version 3.23.2 or later to mitigate the vulnerability.
Monitor website activity for any signs of unauthorized script or HTML injection.

Long-Term Security Practices

Regularly update plugins and software to patch known vulnerabilities.
Implement web application firewalls and security plugins to prevent XSS attacks.

Patching and Updates

Ensure timely installation of security patches and updates for the MailPoet plugin to address the Reflective Server-Side XSS vulnerability.