CVE-2023-45829 MEDIUM

CVE-2023-45829: WordPress Newsletter & Bulk Email Sender Plugin <= 2.0.1 is vulnerable to Cross Site Scripting (XSS)

Vendor Happybox
Product Newsletter & Bulk Email Sender – Email Newsletter Plugin for WordPress
Weakness CWE-79 · XSS
Published October 24, 2023
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in HappyBox Newsletter & Bulk Email Sender – Email Newsletter Plugin for WordPress plugin <= 2.0.1 versions.

Explanation of Vulnerability in Simple Terms

02Summary

The Newsletter & Bulk Email Sender plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability in versions up to 2.0.1. An authenticated user with low privileges can inject malicious scripts into newsletter content. When other users view or interact with the affected newsletter, the injected code executes in their browser, potentially allowing the attacker to steal session tokens, modify page content, or perform actions on their behalf.

What an attacker can do

03Attacker Capabilities

Inject malicious JavaScript that executes when other users view newsletters, stealing their session data or performing actions as them.

Potential impact on your site

04Site Impact

Compromised user accounts, defaced newsletters, and potential unauthorized administrative actions if a high-privilege user views the malicious content.

Conditions required to exploit

05Prerequisites

Attacker needs a low-privilege WordPress account and must trick a user into viewing a newsletter containing the malicious payload.

Key dates

06Disclosure timeline

October 24, 2023 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-12939 Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute CVE-2026-15016 Paid Memberships Pro – Content Restriction, User Registration, & Paid Subscriptions <= 3.8.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting CVE-2026-15333 Cozy Blocks <= 2.2.11 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'cozyCustomFont' Block Attribute CVE-2026-65764 Joomla Extension - phoca.cz - Reflected XSS vulnerability in Phoca Maps 5.0.0-6.1.1 CVE-2026-65510 WordPress PeproDev Ultimate Invoice plugin <= 2.2.6 - Cross Site Scripting (XSS) vulnerability