Vulnerability · Published Sep 3, 2026 · Assigned by NCSC.ch
CVE-2026-84832Unsafe deserialization in the REST interface
High 8.6
In plain English
A high-severity unsafe deserialization in SEPPmail Secure Email Gateway (SEG) from SEPPmail AG. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Severity (CVSS 4.0)8.6High
Exploit odds (30 days)0.6%top 49.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SEPPmail AG | SEPPmail Secure Email Gateway (SEG) | 0 – before 15.0.6 |
Weakness: CWE-502, CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N