PatchSiren cyber security CVE debrief
CVE-2026-8599 mailerpress CVE debrief
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.
- Vendor
- mailerpress
- Product
- MailerPress – Email Marketing, Newsletter, Email Automation & WooCommerce Emails
- CVSS
- MEDIUM 6.4
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-09
- Original CVE updated
- 2026-06-09
- Advisory published
- 2026-06-09
- Advisory updated
- 2026-06-09
Who should care
Users of the MailerPress plugin for WordPress, particularly those with author-level access and above, should be aware of this vulnerability and take steps to mitigate it.
Technical summary
The vulnerability is caused by insufficient input sanitization and output escaping in the Campaign HTML Content Field. This allows authenticated attackers with author-level access and above to inject arbitrary web scripts, which can be executed when a user accesses an injected page.
Defensive priority
MEDIUM
Recommended defensive actions
- Update to version 2.0.5 or later
- Limit access to the admin dashboard to trusted users
- Monitor for suspicious activity in the admin dashboard
Evidence notes
The CVE-2026-8599 record and associated references provide evidence of the vulnerability and its impact.
Official resources
CVE-2026-8599 was published on 2026-06-09T09:16:31.170Z and modified on 2026-06-09T13:33:34.393Z.