CVE-2021-39353 : Security Advisory and Response

This CVE-2021-39353 focuses on a vulnerability in the Easy Registration Forms WordPress plugin, potentially leading to Cross-Site Request Forgery to Stored Cross-Site Scripting.

Understanding CVE-2021-39353

This CVE relates to a security issue in the Easy Registration Forms plugin that could allow attackers to execute Cross-Site Request Forgery attacks.

What is CVE-2021-39353?

The Easy Registration Forms WordPress plugin version 2.1.1 and below is susceptible to Cross-Site Request Forgery due to insufficient validation in the ajax_add_form function.

The Impact of CVE-2021-39353

The vulnerability has a CVSSv3.1 base score of 8.8, indicating a high severity level with significant impacts on confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2021-39353

The following details shed light on the specifics of the CVE.

Vulnerability Description

The issue arises from missing nonce validation in the ajax_add_form function, enabling attackers to inject malicious scripts into the website.

Affected Systems and Versions

Product: Easy Registration Forms
Vendor: Easy Registration Forms
Versions Affected: <= 2.1.1 (Custom version)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Exploitation can result in high impacts on confidentiality, integrity, and availability.

Mitigation and Prevention

Protecting systems from CVE-2021-39353 is crucial.

Immediate Steps to Take

Uninstall the Easy Registration Forms plugin from your WordPress site.

Long-Term Security Practices

Regularly update plugins and themes to prevent vulnerabilities.
Implement web application firewalls for added security.

Patching and Updates

Stay informed about security advisories and apply patches promptly to mitigate risks.