CVE-2026-29133: Seppmail Secure Email Gateway

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to upload PGP keys with UIDs that do not match their email address.

Affected products

• Seppmail Secure Email Gateway: before 15.0.3 (fixed in 15.0.3)

Published 2026-04-02. Last modified 2026-06-17.