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CVE-2026-9177— Server-Side Template Injection in SecureTransport's Apache Velocity mail templates

Quick assessment

Affected
Axway SecureTransport
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.

Axway securetransport是法国Axway公司的一套安全文件传输系统。 Axway SecureTransport 5.5-20260528之前版本存在代码注入漏洞，该漏洞源于邮件模板功能存在服务器端模板注入漏洞，可能导致具有管理员权限的攻击者注入任意Java代码表达式，并在服务器端执行，从而导致完全主机被控制。

CVSS 9.4 · Critical EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Axway SecureTransport 5.5-20260326< 5.5-20260528 affected
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I. Basic Information for CVE-2026-9177

Vulnerability Information
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Vulnerability Title
Server-Side Template Injection in SecureTransport's Apache Velocity mail templates
Source: CVE Program / CVE List V5
Vulnerability Description
A Server-Side Template Injection (SSTI) vulnerability was identified in the mail template functionality of the Axway SecureTransport product in version 5.5-20260326. This flaw allows an attacker with admin privileges to inject arbitrary Java code expressions, which are executed server-side when the template is rendered (i.e., during email sending). Successful exploitation of this flaw allows an attacker to execute arbitrary code on the server that results in full host compromise. This issue affects all Axway SecureTransport versions prior 5.5-20260528 update.
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:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
Axway SecureTransport 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Axway securetransport是法国Axway公司的一套安全文件传输系统。 Axway SecureTransport 5.5-20260528之前版本存在代码注入漏洞，该漏洞源于邮件模板功能存在服务器端模板注入漏洞，可能导致具有管理员权限的攻击者注入任意Java代码表达式，并在服务器端执行，从而导致完全主机被控制。
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
Axway SecureTransport 5.5-20260326 ~ 5.5-20260528 -

II. Public POCs for CVE-2026-9177

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III. Intelligence Information for CVE-2026-9177

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Security Blog Posts for CVE-2026-9177 (1)

Vendor Pages for CVE-2026-9177 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1336