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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.

SEPPmail Secure Email Gateway是瑞士SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.6之前版本存在安全漏洞，该漏洞源于在特权REST导入工作流中反序列化攻击者控制的数据且验证不足，可能导致具有特权API令牌的攻击者以“nobody”权限执行任意命令。

CVSS 8.6 · High EPSS 0.64% · P50

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
Vulnerability Title
SEPPmail Secure Email Gateway 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SEPPmail Secure Email Gateway是瑞士SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.6之前版本存在安全漏洞，该漏洞源于在特权REST导入工作流中反序列化攻击者控制的数据且验证不足，可能导致具有特权API令牌的攻击者以“nobody”权限执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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