CVE-2021-36849 : Exploit Details and Defense Strategies

A detailed look into the Authenticated Stored Cross-Site Scripting (XSS) vulnerability in the Social Media Share Buttons plugin for WordPress.

Understanding CVE-2021-36849

This CVE highlights a security flaw in the Social Media Share Buttons plugin for WordPress, allowing authenticated users to execute stored XSS attacks.

What is CVE-2021-36849?

The CVE-2021-36849 CVE pertains to an Authenticated Stored Cross-Site Scripting (XSS) vulnerability present in René Hermenau's Social Media Share Buttons plugin version 3.8.1 and below for WordPress.

The Impact of CVE-2021-36849

With a CVSS base score of 3.4 (Low), this vulnerability requires high privileges to exploit but could result in unauthorized script execution.

Technical Details of CVE-2021-36849

The specifics of the vulnerability, affected systems, and how attackers can leverage this flaw.

Vulnerability Description

The vulnerability allows authenticated (admin+) users to store malicious scripts that can be executed in the context of other users visiting the affected site.

Affected Systems and Versions

The vulnerability affects versions of the Social Media Share Buttons plugin up to and including 3.8.1 for WordPress.

Exploitation Mechanism

Attackers with high privileges can exploit this vulnerability by injecting malicious scripts into the plugin, potentially leading to unauthorized script execution.

Mitigation and Prevention

Guidelines to reduce the risk posed by CVE-2021-36849 and ensure the security of WordPress sites.

Immediate Steps to Take

Admins should update the plugin to versions beyond 3.8.1 or seek alternative solutions to mitigate the risk of stored XSS attacks.

Long-Term Security Practices

Regular security audits, user permissions review, and educating users on safe practices can enhance the overall security posture of WordPress websites.

Patching and Updates

Stay proactive with plugin updates, security patches, and monitoring for vulnerable plugins to prevent exploitation of known vulnerabilities.