CVE-2021-24423 : Security Advisory and Response

A Stored Cross-Site Scripting vulnerability has been identified in the UpdraftPlus WordPress Backup Plugin before version 1.6.59, allowing high privilege users to inject malicious JavaScript payloads into the updraft_service settings.

Understanding CVE-2021-24423

This CVE concerns a security issue in the UpdraftPlus WordPress Backup Plugin that could be exploited by attackers to execute malicious scripts on vulnerable websites.

What is CVE-2021-24423?

The UpdraftPlus WordPress Backup Plugin version prior to 1.6.59 fails to properly sanitize its updraft_service settings, enabling privileged users to insert harmful JavaScript code, resulting in a Stored Cross-Site Scripting vulnerability.

The Impact of CVE-2021-24423

The vulnerability allows attackers with high privileges to inject malicious scripts into affected websites, potentially leading to unauthorized actions, data theft, or manipulation.

Technical Details of CVE-2021-24423

This section outlines the specifics of the vulnerability, including affected systems, exploitation mechanisms, and more.

Vulnerability Description

UpdraftPlus WordPress Backup Plugin before version 1.6.59 does not adequately sanitize its updraft_service settings, permitting authenticated users with elevated privileges to introduce malicious JavaScript payloads.

Affected Systems and Versions

The vulnerability impacts UpdraftPlus WordPress Backup Plugin versions prior to 1.6.59.

Exploitation Mechanism

Attackers with high privileges can exploit this vulnerability by inserting malicious JavaScript code into the updraft_service settings, potentially leading to stored Cross-Site Scripting attacks.

Mitigation and Prevention

Mitigation strategies and preventive measures to address CVE-2021-24423 are crucial for maintaining website security.

Immediate Steps to Take

Users are advised to update the UpdraftPlus WordPress Backup Plugin to version 1.6.59 or newer to mitigate the vulnerability. Additionally, audit and sanitize user inputs to prevent XSS attacks.

Long-Term Security Practices

Implement security best practices such as regular security audits, restricting user privileges, and staying informed about plugin updates and security patches.

Patching and Updates

Regularly check for plugin updates and apply patches promptly to ensure vulnerabilities are addressed in a timely manner.