CVE-2021-42078 : Security Advisory and Response

PHP Event Calendar through 2021-11-04 is vulnerable to persistent cross-site scripting (XSS) through the /server/ajax/events_manager.php title parameter.

Understanding CVE-2021-42078

PHP Event Calendar through 2021-11-04 allows for persistent cross-site scripting (XSS) attacks, enabling an attacker to execute malicious scripts on the victim's browser.

What is CVE-2021-42078?

Persistent cross-site scripting (XSS) vulnerability in PHP Event Calendar through 2021-11-04 allows attackers to inject malicious scripts onto web pages viewed by other users.

The Impact of CVE-2021-42078

The vulnerability permits an adversary to execute damaging actions within the context of other users, potentially leading to unauthorized actions or defacement of the website.

Technical Details of CVE-2021-42078

The technical aspects of the CVE-2021-42078 vulnerability are:

Vulnerability Description

PHP Event Calendar through 2021-11-04 is susceptible to persistent cross-site scripting (XSS) attacks.

Affected Systems and Versions

Product: PHP Event Calendar
Vendor: N/A
Versions: through 2021-11-04

Exploitation Mechanism

Attackers can exploit the vulnerability using the /server/ajax/events_manager.php title parameter to inject malicious scripts, impacting users viewing the affected page.

Mitigation and Prevention

To address CVE-2021-42078, consider the following steps:

Immediate Steps to Take

Ensure the PHP Event Calendar application is updated to the latest version.
Implement input validation and output encoding to prevent XSS attacks.

Long-Term Security Practices

Regularly monitor and update web applications and plugins for security patches.
Educate users on safe browsing practices to minimize the risk of XSS attacks.

Patching and Updates

Apply security patches provided by the PHP Event Calendar developers to mitigate the XSS vulnerability.