CVE-2021-24309 : Exploit Details and Defense Strategies

Weekly Schedule WordPress plugin before version 3.4.3 is susceptible to an Authenticated Stored Cross-Site Scripting (XSS) vulnerability that allows a user to inject malicious JavaScript code through the "Schedule Name" input field.

Understanding CVE-2021-24309

This CVE tracks a security issue in the Weekly Schedule WordPress plugin that enables an authenticated user to execute a stored XSS attack.

What is CVE-2021-24309?

The vulnerability in the plugin's general options fails to properly sanitize user input, enabling attackers to insert JavaScript code using <script> HTML tags and trigger a stored XSS flaw.

The Impact of CVE-2021-24309

Exploitation of this vulnerability could lead to unauthorized access, data compromise, and the potential for complete control of the affected WordPress site by malicious actors.

Technical Details of CVE-2021-24309

The following provides more detailed information about the vulnerability.

Vulnerability Description

The issue lies in the inadequate input sanitization of the "Schedule Name" field, which permits attackers to embed malicious scripts.

Affected Systems and Versions

Weekly Schedule versions prior to 3.4.3 are affected by this vulnerability.

Exploitation Mechanism

Attackers with authenticated access can leverage the vulnerable input field to inject harmful scripts, leading to XSS attacks.

Mitigation and Prevention

To safeguard your system from CVE-2021-24309, apply the following mitigation strategies.

Immediate Steps to Take

Ensure you have updated to the latest version of the Weekly Schedule plugin (version 3.4.3) to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly update all WordPress plugins and themes to the latest versions to address security vulnerabilities promptly.

Patching and Updates

Stay informed about security updates for the Weekly Schedule plugin and apply patches as soon as they are released to protect your WordPress site from potential threats.