CVE-2021-24528 : Security Advisory and Response

FluentSMTP WordPress plugin before version 2.0.1 is vulnerable to an Authenticated Stored Cross-Site Scripting (XSS) attack due to inadequate input sanitization, potentially leading to malicious script execution.

Understanding CVE-2021-24528

This CVE involves an XSS vulnerability in the FluentSMTP WordPress plugin, allowing attackers to insert malicious scripts into the plugin's settings stored in the database.

What is CVE-2021-24528?

The vulnerability in FluentSMTP plugin version less than 2.0.1 allows privileged users to execute stored XSS attacks by manipulating plugin settings.

The Impact of CVE-2021-24528

Attackers with plugin management rights can exploit this flaw to inject and execute malicious scripts, compromising the security and integrity of WordPress sites.

Technical Details of CVE-2021-24528

This section delves into the specifics of the vulnerability, affected systems, and how the exploitation occurs.

Vulnerability Description

The lack of input sanitization in FluentSMTP plugin versions prior to 2.0.1 exposes WordPress sites to stored XSS attacks, enabling threat actors to inject and execute arbitrary scripts.

Affected Systems and Versions

FluentSMTP versions lower than 2.0.1 are affected by this security flaw, requiring immediate attention from website administrators to mitigate the risk.

Exploitation Mechanism

Privileged users capable of managing plugins can exploit this vulnerability by manipulating the plugin's settings, allowing them to inject malicious scripts that are executed when viewing SMTP settings.

Mitigation and Prevention

To secure WordPress sites from CVE-2021-24528, implement the following mitigation strategies:

Immediate Steps to Take

Update FluentSMTP to version 2.0.1 or later to patch the XSS vulnerability.
Restrict plugin management capabilities to trusted users to prevent unauthorized changes.

Long-Term Security Practices

Regularly monitor for plugin updates and security advisories to stay informed about potential vulnerabilities.
Conduct security audits of WordPress plugins to identify and address security weaknesses proactively.

Patching and Updates

Apply security patches promptly and ensure all WordPress plugins are up-to-date to mitigate the risk of XSS attacks.