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CVE-2026-84832— Unsafe deserialization in the REST interface

Quick assessment

Affected
SEPPmail AG SEPPmail Secure Email Gateway (SEG)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

版本早于 15.0.6 的 SEPPmail Secure Email Gateway 在一个拥有特权的 REST 导入工作流中，对攻击者可控的数据进行反序列化，且缺乏充分的验证。拥有特权 API 令牌的攻击者可以以“nobody”权限执行任意命令。

CVSS 8.6 · High EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
SEPPmail AG SEPPmail Secure Email Gateway (SEG) < 15.0.6 affected
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I. Basic Information for CVE-2026-84832

Vulnerability Information
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Vulnerability Title
Unsafe deserialization in the REST interface
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SEPPmail AG SEPPmail Secure Email Gateway (SEG) 0 ~ 15.0.6 -

II. Public POCs for CVE-2026-84832

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III. Intelligence Information for CVE-2026-84832

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Vendor Pages for CVE-2026-84832 (1)

Same Patch Batch · SEPPmail AG · 2026-09-03 · 3 CVEs total

CVE-2026-84830 8.6 HIGH OS command injection in privileged configuration handling
CVE-2026-84831 7.7 HIGH Mandatory MFA bypass before enrollment

IV. Related Vulnerabilities

Same product: SEPPmail Secure Email Gateway (SEG)
Same vendor: SEPPmail AG
Same weakness: CWE-502

V. Comments for CVE-2026-84832

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