CVE-2026-9177
SSTI in Axway SecureTransport mail templates enables server-side Java execution.
Is CVE-2026-9177 being exploited?
Not confirmed. CVE-2026-9177 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-9177?
CVE-2026-9177 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-9177?
Yes. A fix has been recorded for CVE-2026-9177. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-9177 affect?
CVE-2026-9177 affects Axway SecureTransport < 5.5-20260528 (e.g., 5.5-20260326). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-9177?
Install update 5.5-20260528; restrict admin access and audit mail templates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Admin-controlled SSTI executes arbitrary Java during email rendering, enabling full host compromise and remote code execution.
Immediate action required
- affected>= 5.5-20260326 and < 5.5-20260528
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.