---
id: CVE-2026-84832
title: Unsafe deserialization in the REST interface
summary: >-
  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" priv…
severity: high
cvss: 8.6
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-502
  - CWE-78
vendor: SEPPmail AG
product: SEPPmail Secure Email Gateway (SEG)
affected:
  - seppmail_secure_email_gateway_seg < 15.0.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-03T12:32:58.941461Z'
published: '2026-09-03'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:16:22.371Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-84832'
references:
  - url: 'https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html'
tags:
  - cve.org
epss: 0.00637
epssPercentile: 0.48895
ingestedAt: '2026-10-08T11:31:27.692Z'
---

## Overview

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

- `seppmail_secure_email_gateway_seg < 15.0.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.