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CVE-2026-44129— Server-side template injection

Quick assessment

Affected
SEPPmail AG Secure Email Gateway
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是德国SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.4之前版本存在安全漏洞，该漏洞源于新GINA UI中端点接受攻击者控制的模板，可能导致服务器端模板注入，远程攻击者执行任意模板表达式并可能实现远程代码执行。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.73% · P53

Affected Version Matrix 1

VendorProduct Version RangeStatus
SEPPmail AG Secure Email Gateway < 15.0.4 affected
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I. Basic Information for CVE-2026-44129

Vulnerability Information
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Vulnerability Title
Server-side template injection
Source: CVE Program / CVE List V5
Vulnerability Description
SEPPmail Secure Email Gateway before version 15.0.4 contains a server-side template injection vulnerability in the new GINA UI because an endpoint accepts attacker-controlled template, allowing remote attackers to execute arbitrary template expressions and potentially achieve remote code execution depending on the enabled template plugins.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
SEPPmail Secure Email Gateway 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SEPPmail Secure Email Gateway是德国SEPPmail公司的一个电子邮件安全网关。 SEPPmail Secure Email Gateway 15.0.4之前版本存在安全漏洞，该漏洞源于新GINA UI中端点接受攻击者控制的模板，可能导致服务器端模板注入，远程攻击者执行任意模板表达式并可能实现远程代码执行。
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 Secure Email Gateway 0 ~ 15.0.4 -

II. Public POCs for CVE-2026-44129

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III. Intelligence Information for CVE-2026-44129

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Security Blog Posts for CVE-2026-44129 (1)

Same Patch Batch · SEPPmail AG · 2026-05-08 · 6 CVEs total

CVE-2026-7864 Exposure of Sensitive Information to an Unauthorized Actor
CVE-2026-44127 Local File Inclusion (LFI) and Arbitrary File Deletion
CVE-2026-44125 Missing Authorization in GINAv2
CVE-2026-44128 Unauthenticated Remote Code Execution
CVE-2026-44126 Insecure deserialization

IV. Related Vulnerabilities

Same product: Secure Email Gateway
Same vendor: SEPPmail AG
Same weakness: CWE-1336

V. Comments for CVE-2026-44129

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