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CVE-2026-18437

MailPress <= 1.5.0 - Missing Authorization to Unauthenticated Contact Updates

The MailerPress – Newsletter, email marketing & AI automation plugin for WordPress is vulnerable to unauthorized access due to a missing capability check on the `mailerpress/v1/contact` endpoint in all versions up to, and including, 1.5.0. This makes it possible for unauthenticated attackers to update contact details.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mailerpress Wordpress
Products
Mailerpress – Newsletter, Email Marketing & Ai Automation Wordpress
CVE-2026-18436

MailerPress <= 1.5.0 - Missing Authorization to Unauthenticated Arbitrary Modification via REST API Endpoint

The MailPress plugin for WordPress is vulnerable to unauthorized access in versions up to, and including, 1.5.0 via the campaign revision-restore REST endpoint (POST /wp-json/mailpress/v1/campaign/<id>/restore-revision/<revision_id>). The route in the vulnerable range was registered without a permissionCallback, allowing the restoreRevision() handler to run for unauthenticated requests and overwrite a campaign's content_html with any prior revision. This makes it possible for unauthenticated attackers to modify campaign content by restoring an arbitrary revision.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mailerpress Wordpress
Products
Mailerpress – Newsletter, Email Marketing & Ai Automation Wordpress
CVE-2026-8599

MailerPress <= 2.0.4 - Authenticated (Author+) Stored Cross-Site Scripting via Campaign HTML Content Field

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.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mailerpress Wordpress
Products
Mailerpress – Email Marketing, Newsletter, Email Automation & Woocommerce Emails Wordpress