CVE-2026-39791: Mailjet Email Marketing

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Unauthenticated Sensitive Data Exposure in Mailjet Email Marketing <= 6.2.3 versions.

Affected products

• Mailjet Mailjet Email Marketing: up to and including 6.2.3

Published 2026-10-06. Last modified 2026-10-06.