Server-Side Template Injection in SecureTransport's Apache Velocity mail templates

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-9177
StatePUBLISHED
AssignerToreon
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-29 14:16:35 UTC
Updated2026-07-30 20:27:10 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 9.4 CRITICAL from 1c6b5737-9389-4011-8117-89fa251edfb2

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002880000 probability, percentile 0.211130000 (date 2026-08-03)

Problem Types: CWE-1336 | CWE-1336 CWE-1336 Improper neutralization of special elements used in a template engine

VersionSourceTypeScoreSeverityVector
4.01c6b5737-9389-4011-8117-89fa251edfb2Secondary9.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C...
4.0CNACVSS9.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
High
Sub Integrity
High
Sub Availability
High

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Axway SecureTransport affected 5.5-20260326 5.5-20260528 SecureTransport Not specified

References

ReferenceSourceLinkTags
support.axway.com/news/4882/lang/en 1c6b5737-9389-4011-8117-89fa251edfb2 support.axway.com
www.toreon.com/CVE-2026-9177 1c6b5737-9389-4011-8117-89fa251edfb2 www.toreon.com
docs.hackjiji.org/blog/cve-2026-9177-ssti-in-securetransport-mft-gateway 1c6b5737-9389-4011-8117-89fa251edfb2 docs.hackjiji.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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