CVE-2021-42663 : Security Advisory and Response

An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL, allowing attackers to manipulate website visibility and display unauthorized content.

Understanding CVE-2021-42663

What is CVE-2021-42663?

This CVE identifies an HTML injection vulnerability in the Sourcecodester Online Event Booking and Reservation System, potentially leading to website content manipulation.

The Impact of CVE-2021-42663

The vulnerability allows attackers to modify website visibility and display their chosen HTML content when a user interacts with a specific link.

Technical Details of CVE-2021-42663

Vulnerability Description

The vulnerability exists in the msg parameter of /event-management/index.php, enabling attackers to exploit the website's visibility settings.

Affected Systems and Versions

Affected Systems: Sourcecodester Online Event Booking and Reservation System
Versions: All versions are affected

Exploitation Mechanism

Attackers can exploit the msg parameter to alter website visibility settings and present unauthorized HTML content.

Mitigation and Prevention

Immediate Steps to Take

Review and sanitize user inputs to prevent injection attacks
Implement Content Security Policy (CSP) headers to mitigate XSS vulnerabilities
Regularly monitor website activity for suspicious behavior

Long-Term Security Practices

Conduct regular security assessments and code reviews
Educate developers on secure coding practices
Keep systems and software up to date to address known vulnerabilities
Utilize web application firewalls to enhance security

Patching and Updates

Apply patches and updates provided by Sourcecodester to address the HTML injection vulnerability.