CVE-2026-8599 MailerPress <= 2.0.4 - Authenticated (Author+) Stored Cross-Site Scripting via Campaign HTML Content Field
Authenticated attackers with author-level access can inject arbitrary scripts into campaign HTML content, executing them in the admin dashboard.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8599?
CVE-2026-8599 is a medium-severity cross-site scripting vulnerability in MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-8599?
How do I fix CVE-2026-8599?
No fix has been published for CVE-2026-8599 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8599 being exploited?
There is no known exploitation of CVE-2026-8599 in the wild and no public exploit code.
Sources
Also known as GHSA-9jw9-xmq5-9839.