CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability

Medium severity, CVSS 6.7. Actively exploited: in CISA KEV since 2026-05-21. EPSS: 0.5% chance of exploitation in the next 30 days.

A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents on affected installations. This vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability.

Affected products

• Trend Micro Apex One: before 14.0.0.17079 (fixed in 14.0.0.17079); before 14.0.20731 (fixed in 14.0.20731)

Published 2026-05-21. Last modified 2026-07-23.