CVE-2023-0546 Explained : Impact and Mitigation

This CVE, assigned by WPScan, pertains to a vulnerability in the FluentForms plugin for WordPress, specifically versions prior to 4.3.25. The vulnerability allows a logged-in user with contributor-level roles to execute stored cross-site scripting (XSS) attacks via a custom HTML form field.

Understanding CVE-2023-0546

This section delves into the details of CVE-2023-0546, shedding light on what the vulnerability entails and its potential impact.

What is CVE-2023-0546?

CVE-2023-0546 highlights a flaw in the Contact Form Plugin for WordPress before version 4.3.25. The issue arises from inadequate sanitization and escaping of the srcdoc attribute in iframes within the plugin's custom HTML field type. This oversight enables a contributor-level user to insert malicious JavaScript into a form, triggering for visitors to the form or admins previewing/editing it.

The Impact of CVE-2023-0546

The impact of this vulnerability is significant as it allows an attacker to execute stored XSS attacks, compromising the security and integrity of the affected WordPress website. With this exploit, sensitive information could be stolen, or malicious actions could be taken on behalf of unsuspecting users.

Technical Details of CVE-2023-0546

Delving deeper into the technical aspects of CVE-2023-0546 unveils key information related to the vulnerability.

Vulnerability Description

The vulnerability in FluentForms plugin allows a user with contributor roles to inject malicious JavaScript code via the srcdoc attribute in iframes within custom HTML fields. This code will execute when the form is visited by users or previewed/edited by administrators.

Affected Systems and Versions

The Contact Form Plugin for WordPress versions below 4.3.25 is affected by this vulnerability. Specifically, any instances running versions less than 4.3.25 are at risk of potential exploitation, with the capability for contributors to leverage stored XSS attacks.

Exploitation Mechanism

By leveraging the lack of proper sanitization and escaping in the srcdoc attribute of iframes, a contributor-level user can insert malicious JavaScript code within the custom HTML form field of the Contact Form Plugin. This malicious script can then be executed when the form is accessed, potentially leading to unauthorized actions or data theft.

Mitigation and Prevention

Understanding how to mitigate and prevent CVE-2023-0546 is crucial in safeguarding WordPress websites against this vulnerability.

Immediate Steps to Take

To mitigate the risk posed by CVE-2023-0546, users are advised to update their Contact Form Plugin to version 4.3.25 or newer. Additionally, reviewing and updating user roles and permissions within WordPress can help restrict access and reduce the likelihood of unauthorized exploitation.

Long-Term Security Practices

Implementing robust security measures, such as regular security audits, employing security plugins, and educating users on safe practices, can enhance the overall security posture of WordPress websites and help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitoring for plugin updates and promptly applying patches from trusted sources is essential to address known vulnerabilities like CVE-2023-0546. By staying vigilant and keeping software up-to-date, website owners can effectively protect their platforms from potential threats.