PatchSiren

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8599 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8599

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8599 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8599

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.