CVE-2021-33851 Explained : Impact and Mitigation

A detailed overview of CVE-2021-33851, a cross-site scripting vulnerability found in the WordPress Customize Login Image Plugin.

Understanding CVE-2021-33851

This section covers what CVE-2021-33851 entails, its impact, technical details, and mitigation strategies.

What is CVE-2021-33851?

CVE-2021-33851 is a cross-site scripting (XSS) vulnerability that allows an attacker to execute arbitrary JavaScript code in a user's browser by leveraging the "Custom logo link" feature in the Customize Login Image Plugin.

The Impact of CVE-2021-33851

The XSS payload injected through the vulnerable feature can be used to carry out various malicious activities like stealing sensitive information, session hijacking, or delivering malware to users visiting the affected WordPress site.

Technical Details of CVE-2021-33851

This section provides insights into the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The XSS vulnerability in Version 3.4 of the Customize Login Image Plugin allows attackers to execute arbitrary code in users' browsers through the "Custom logo link" feature.

Affected Systems and Versions

The WordPress Customize Login Image Plugin Version 3.4 is confirmed to be affected by CVE-2021-33851.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious XSS payload and tricking a user into opening the Settings Page of the affected plugin, triggering the code execution.

Mitigation and Prevention

Explore the necessary steps to mitigate the risks posed by CVE-2021-33851 and prevent future vulnerabilities.

Immediate Steps to Take

Website administrators are advised to update the Customize Login Image Plugin to a patched version and sanitize user inputs to prevent XSS attacks.

Long-Term Security Practices

Regularly monitor security advisories, conduct security assessments, and implement secure coding practices to mitigate the risk of XSS vulnerabilities.

Patching and Updates

Stay informed about security patches released by the plugin developer and apply updates promptly to ensure your WordPress site remains secure.