High severity · published May 8, 2026
CVE-2026-44129
Server-side template injection
8.3
CVSS
0.5%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
Secure Email Gateway · SEPPmail AG
before 15.0.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44129
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44129
downloads.seppmail.com
https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#security
labs.infoguard.ch
https://labs.infoguard.ch/posts/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128/
More from Secure Email Gateway
9.3
CVE-2026-44125
Missing Authorization in GINAv2
9.3
CVE-2026-44128
Unauthenticated Remote Code Execution
9.2
CVE-2026-44126
Insecure deserialization
8.8
CVE-2026-44127
Local File Inclusion (LFI) and Arbitrary File Deletion
8.6
CVE-2026-84830
OS command injection in privileged configuration handling