CVE-2021-43977: SmarterTools SmarterMail

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

SmarterTools SmarterMail 16.x through 100.x before 100.0.7803 allows XSS.

Affected products

• SmarterTools SmarterMail: from 16.0.6345, before 100.0.7803 (fixed in 100.0.7803)

Published 2021-11-17. Last modified 2026-06-17.