What the vulnerability does
01Description
The MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Campaign HTML Content Field in all versions up to, and including, 2.0.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The public-facing campaign preview endpoint (/mp-email/{id}-slug/) is not affected by this vulnerability, as it applies a Content-Security-Policy header blocking all inline scripts; exploitation is limited to the admin dashboard preview.
Explanation of Vulnerability in Simple Terms
02Summary
MailerPress versions up to 2.0.4 contain a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. When other users view affected content, the injected code executes in their browsers, potentially compromising their accounts or stealing sensitive data. The vulnerability affects the site's scope, meaning impacts may extend beyond the vulnerable component itself.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute when other users view the affected content.
Potential impact on your site
04Site Impact
Authenticated users can inject code that affects other users' sessions and data; site-wide trust is compromised.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account (e.g., subscriber or contributor role) on the site.
Key dates
06Disclosure timeline
June 9, 2026
CVE published
June 9, 2026
Record updated
