CVE-2017-8103 : Security Advisory and Response

In versions of MyBB prior to 1.8.11, a vulnerability in the Email MyCode feature could potentially lead to cross-site scripting (XSS) attacks through the use of an onmouseover event.

Understanding CVE-2017-8103

This CVE identifies a specific vulnerability in MyBB versions before 1.8.11 that allows for XSS attacks.

What is CVE-2017-8103?

CVE-2017-8103 is a security vulnerability found in MyBB versions prior to 1.8.11, specifically within the Email MyCode feature. This vulnerability can be exploited to execute cross-site scripting attacks by utilizing an onmouseover event.

The Impact of CVE-2017-8103

The presence of this vulnerability could potentially allow malicious actors to inject and execute arbitrary code within the context of a user's web browser, leading to various security risks such as data theft, unauthorized access, and manipulation of content.

Technical Details of CVE-2017-8103

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability in MyBB before version 1.8.11 lies in the Email MyCode component, enabling XSS attacks through actions like an onmouseover event.

Affected Systems and Versions

Product: MyBB
Vendor: N/A
Versions affected: All versions before 1.8.11

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious payload that triggers the XSS vulnerability when a user interacts with the affected Email MyCode feature.

Mitigation and Prevention

Protecting systems from CVE-2017-8103 involves immediate actions and long-term security practices.

Immediate Steps to Take

Update MyBB to version 1.8.11 or newer to mitigate the vulnerability.
Educate users about the risks of interacting with untrusted content or links.

Long-Term Security Practices

Regularly monitor and audit web applications for security vulnerabilities.
Implement input validation and output encoding to prevent XSS attacks.

Patching and Updates

Stay informed about security updates and patches released by MyBB.
Apply patches promptly to ensure the system is protected against known vulnerabilities.