CVE-2026-44129 Server-side template injection
Remote attackers can execute arbitrary template expressions in SEPPmail Secure Email Gateway, potentially achieving remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44129?
CVE-2026-44129 is a high-severity code injection vulnerability in SEPPmail AG Secure Email Gateway, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1336
Which versions are affected by CVE-2026-44129?
How do I fix CVE-2026-44129?
No fix has been published for CVE-2026-44129 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44129 being exploited?
There is no known exploitation of CVE-2026-44129 in the wild and no public exploit code.
Sources
Also known as GHSA-wc7f-vvj8-28m9.