CVE-2026-44126 Insecure deserialization
Unauthenticated remote attackers can execute arbitrary code via insecure deserialization in the GINA UI of SEPPmail Secure Email Gateway.
- 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-2026-44126?
CVE-2026-44126 is a critical unsafe deserialization 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 insecurely deserializes untrusted data, which can be reached from the new GINA UI and may allow unauthenticated remote attackers to execute code via a crafted serialized object.
Weakness: CWE-502
Which versions are affected by CVE-2026-44126?
How do I fix CVE-2026-44126?
No fix has been published for CVE-2026-44126 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-44126 being exploited?
There is no known exploitation of CVE-2026-44126 in the wild and no public exploit code.
Sources
Also known as GHSA-69wg-m4qc-c3qc.