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Vulnerability record · CVE-2026-9177 · published 29 July 2026

CVE-2026-9177: A Server-Side Template Injection (SSTI) vulnerability was identified in the mail template functionality of th…

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.

9.4 CVSS 4.0 Critical EPSS 0.50% · top 59.5% CWE-1336 · CWE-1336 Awaiting Analysis
9.4CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
30 Jul 2026Last modified by NVD

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: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:

References

LinkTags
https://docs.hackjiji.org/blog/cve-2026-9177-ssti-in-securetransport-mft-gateway
https://support.axway.com/news/4882/lang/en
https://www.toreon.com/CVE-2026-9177

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Source: NIST National Vulnerability Database (record CVE-2026-9177), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.