CVE-2026-44129: Seppmail AG Secure Email Gateway

High severity, CVSS 8.3. EPSS: 0.7% chance of exploitation in the next 30 days.

SEPPmail Secure Email Gateway before version 15.0.4 contains a server-side template injection vulnerability in the new GINA UI because an endpoint accepts attacker-controlled template, allowing remote attackers to execute arbitrary template expressions and potentially achieve remote code execution depending on the enabled template plugins.

Affected products

• Seppmail AG Secure Email Gateway: before 15.0.4 (fixed in 15.0.4)

Published 2026-05-08. Last modified 2026-06-17.