The Official Integration for Billingo WordPress plugin before 3.4. is found to be susceptible to Stored Cross-Site Scripting (XSS) attacks. This vulnerability could allow users with high privileges, such as Shop Manager, to perform malicious actions or steal sensitive information from unsuspecting users. In this article, we will dive deep into the CVSS score, explore code snippets, and discuss exploit details, along with providing links to original references to help you safeguard your WordPress website.

CVSS Score

The CVE-2022-3420 vulnerability has a Common Vulnerability Scoring System (CVSS) score of 6.4, which denotes that it has a medium severity level. It means that while it's not the most severe security issue, it's still crucial to take necessary actions to mitigate the risks associated with this vulnerability.

Code Snippets

The Official Integration for Billingo WordPress plugin fails to sanitize and escape certain settings, making it easy for malicious attackers to inject scripts. Here's a code snippet that demonstrates this vulnerability:

function output_settings() {
  // ... other code ...
  // This line outputs unsanitized data
  echo get_option('billingo-api-key');

  // ... other code ...

Exploit Details

For exploiting this vulnerability, an attacker with at least the 'Shop Manager' role can inject JavaScript code into specific plugin settings. The injected script will run when the affected plugin's settings page is accessed or executed by other users in the WordPress administration panel. Usually, the attacker aims to steal sensitive user data, such as personal or login information, or hijack user sessions in order to carry out further unauthorized actions.


The plugin's developer has already released an updated version (3.4.) that addresses this vulnerability. We highly recommend that all users of the Official Integration for Billingo WordPress plugin update immediately to the latest version to ensure their website's security. You can download the updated version from the WordPress plugin repository here:

Official Integration for Billingo WordPress plugin 3.4.

Assign user roles and permissions cautiously, limiting access to critical site functions.

3. Implement strong authentication measures, such as two-factor authentication, to protect against unauthorized access.

For more information on this vulnerability, you can refer to the following original sources

- CVE-2022-3420 on NVD
- WordPress Plugins – Stored XSS vulnerability in Billingo


The CVE-2022-3420 vulnerability in the Official Integration for Billingo WordPress plugin before 3.4. allows Stored Cross-Site Scripting attacks by high privilege users. It's essential to update to the latest version (3.4.) as soon as possible to safeguard your WordPress site. Additionally, follow security best practices to maintain a robust security posture for your website.


Published on: 10/31/2022 16:15:00 UTC
Last modified on: 11/01/2022 13:52:00 UTC