CVE-2026-66703: Properfraction Mailoptin

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.

Affected products

• Properfraction Mailoptin: up to and including 1.2.78.0

Published 2026-08-06. Last modified 2026-08-12.