CVE-2026-44129 PUBLISHED

Server-side template injection

Assigner: NCSC.ch
Reserved: 05.05.2026 Published: 08.05.2026 Updated: 08.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS Score: 8.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	SEPPmail AG
Product	Secure Email Gateway
Versions	Default: unaffected affected from 0 to 15.0.4 (excl.)

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#security

Problem Types

CWE-1336 Improper neutralization of special elements used in a template engine CWE

Impacts

CAPEC-101 Server Side Include (SSI) Injection