PT-2026-20287 · Yaysmtp+1 · Yaysmtp+1

Daniel Basta + 1 · Published 2026-02-18 · Updated 2026-02-18 · CVE-2026-1831

Positive Technologies (AI Summary)

CVSS v3.1

2.7

Low

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions YayMail - WooCommerce Email Customizer plugin versions up to and including 4.3.2

Description The YayMail - WooCommerce Email Customizer plugin for WordPress has a flaw that allows unauthorized plugin installation and activation. This is due to missing capability checks on the yaymail install yaysmtp AJAX action and the /yaymail/v1/addons/activate API endpoint. Attackers with Shop Manager-level access or higher can exploit this to install and activate the YaySMTP plugin.

Recommendations Update YayMail - WooCommerce Email Customizer plugin to a version later than 4.3.2.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-1831

Affected Products

Yaymail – Woocommerce Email Customizer

Yaysmtp

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-1831 · Security Note
• https://twitter.com/CVEnew/status/2024038163505623179 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/a568162a-5a2d-47ab-9dfe-2f2f5f324f0d?source=cve · Note
• https://twitter.com/VulmonFeeds/status/2024156499363143782 · Twitter Post
• https://t.me/CVEtracker/44953 · Telegram Post
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3460087%40yaymail&new=3460087%40yaymail&sfp_email=&sfph_mail=#file11 · Note
• https://plugins.trac.wordpress.org/browser/yaymail/trunk/src/Ajax.php#L183 · Note
• https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Controllers/AddonController.php#L76 · Note
• https://plugins.trac.wordpress.org/browser/yaymail/tags/4.3.2/src/Ajax.php#L183 · Note