Vulnerability · Published May 8, 2026 · Assigned by NCSC.ch
CVE-2026-44126Insecure deserialization
Critical 9.2
In plain English
A critical-severity unsafe deserialization in Secure Email Gateway 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 0.5% (higher than 41% of all known vulnerabilities).
Severity (CVSS 4.0)9.2Critical
Exploit odds (30 days)0.5%top 59.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SEPPmail AG | Secure Email Gateway | 0 – before 15.0.4 |
Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N