CVE-2026-84832 PUBLISHED

Unsafe deserialization in the REST interface

Assigner: NCSC.ch
Reserved: 02.09.2026 Published: 03.09.2026 Updated: 03.09.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 8.6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	SEPPmail AG
Product	SEPPmail Secure Email Gateway (SEG)
Versions	Default: unaffected affected from 0 to 15.0.6 (excl.)

Credits

Emposo GmbH finder

References

https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html

Problem Types

CWE-502 Deserialization of untrusted data CWE
CWE-78 Improper neutralization of special elements used in an OS command ('OS command injection') CWE

Impacts

CAPEC-586 Object Injection