CVE-2026-84832 Unsafe deserialization in the REST interface
An attacker with a privileged API token can execute arbitrary commands via unsafe deserialization in the REST interface.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84832?
CVE-2026-84832 is a high-severity unsafe deserialization vulnerability in SEPPmail Secure Email Gateway (SEG), published on 3 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
SEPPmail Secure Email Gateway before 15.0.6 deserializes attacker-controlled data in a privileged REST import workflow without adequate validation. An attacker with a privileged API token can execute arbitrary commands with "nobody" privileges.
Which versions are affected by CVE-2026-84832?
How do I fix CVE-2026-84832?
No fix has been published for CVE-2026-84832 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-2026-84832 being exploited?
There is no known exploitation of CVE-2026-84832 in the wild and no public exploit code.
Sources
Also known as GHSA-223j-mh9x-75cm.