CVE-2026-9177: CWE-1336 Improper neutralization of special elements used in a template engine in Axway SecureTransport
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.
CVE-2026-9177: CWE-1336 Improper neutralization of special elements used in a template engine in Axway SecureTransport
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.
CVSS v4.0
Score 9.4critical
Affected software
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Toreon
- Date Reserved
- 2026-05-21T14:43:42.513Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6a093d9c2644c7f89a31d4
Added to database: 07/29/2026, 14:07:57 UTC
Last updated: 07/29/2026, 14:07:57 UTC
Views: 1
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