CVE-2023-27890 : What You Need to Know

This CVE record pertains to a vulnerability in the Export User plugin through version 2.0 for MyBB, which allows for Cross-Site Scripting (XSS) attacks when an admin is generating DSGVO data for a user. It specifically occurs through fields such as Custom User Title, Location, or Bio. It is important to note that this vulnerability impacts products that are no longer supported by the maintainer.

Understanding CVE-2023-27890

This section delves into the details of CVE-2023-27890, explaining its nature and implications.

What is CVE-2023-27890?

CVE-2023-27890 is a security flaw found in the Export User plugin in MyBB versions up to 2.0, enabling malicious actors to execute Cross-Site Scripting attacks during the data generation process for a user by an admin.

The Impact of CVE-2023-27890

The exploitation of CVE-2023-27890 can lead to unauthorized access to sensitive information, injection of malicious scripts, and potentially compromise the security and integrity of the affected systems.

Technical Details of CVE-2023-27890

In this section, we will explore the technical aspects of CVE-2023-27890 to better understand its scope and implications.

Vulnerability Description

The vulnerability in the Export User plugin allows attackers to inject and execute malicious scripts via the Custom User Title, Location, or Bio fields during the DSGVO data generation process by an admin.

Affected Systems and Versions

This vulnerability impacts MyBB products utilizing the Export User plugin up to version 2.0. It specifically affects instances that are no longer receiving support from the maintainer.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious input in the Custom User Title, Location, or Bio fields, which, when processed by the Export User plugin, can trigger XSS attacks.

Mitigation and Prevention

To safeguard systems against the CVE-2023-27890 vulnerability, it is crucial to implement appropriate mitigation strategies.

Immediate Steps to Take

Discontinue the use of unsupported MyBB products that utilize the Export User plugin.
Regularly monitor for security updates and patches related to MyBB plugins and extensions.
Educate administrators and users about the risks associated with XSS vulnerabilities and best practices for secure data handling.

Long-Term Security Practices

Transition to supported versions of MyBB and associated plugins for ongoing software maintenance and security updates.
Implement input validation and output encoding practices to mitigate XSS risks in web applications.
Conduct regular security audits and assessments to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories and updates from MyBB regarding CVE-2023-27890. Apply patches and upgrades as soon as they are made available to address the vulnerability and enhance the overall security posture of the system.