CVE-2026-1831

The YayMail - WooCommerce Email Customizer plugin for WordPress is vulnerable to unauthorized plugin installation and activation due to missing capability checks on the 'yaymail_install_yaysmtp' AJAX action and `/yaymail/v1/addons/activate` REST endpoint in all versions up to, and including, 4.3.2. This makes it possible for authenticated attackers, with Shop Manager-level access and above, to install and activate the YaySMTP plugin.

The following products are affected by CVE-2026-1831 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-1831.

URL	Resource
https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Ajax.php#L183
https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Controllers/AddonController.php#L76
https://plugins.trac.wordpress.org/browser/yaymail/trunk/src/Ajax.php#L183
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3460087%40yaymail&new=3460087%40yaymail&sfp_email=&sfph_mail=#file11
https://www.wordfence.com/threat-intel/vulnerabilities/id/a568162a-5a2d-47ab-9dfe-2f2f5f324f0d?source=cve