Trend Micro · Apex One
CVE-2026-34926
Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
What it is
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.
CISA: Trend Micro Apex One (on-premise) contains a directory traversal vulnerability that 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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: June 4, 2026
More exploited flaws from Trend Micro
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Aug 18, 2025 | OS Command Injection | Apex One | Critical 9.4 | 25% |
| Sep 21, 2023 | Remote Code Execution | Apex One and Worry-Free Business Security | High 7.2 | 4.2% |
| Sep 15, 2022 | Improper Validation | Apex One and Apex One as a Service | High 7.2 | 3.4% |
| Mar 31, 2022 | Arbitrary File Upload | Apex Central | Critical 9.8 | 19% |
| Nov 3, 2021 | Remote Code Execution | Apex One and OfficeScan | High 8.8 | 11% |
| Nov 3, 2021 | Multiple Products Content Validation Escape | Apex One, OfficeScan and Worry-Free Business Security Agents | High 8.8 | 6.2% |
| Nov 3, 2021 | Authentication Bypass | Apex One and OfficeScan | Critical 9.8 | 12% |
| Nov 3, 2021 | Directory Traversal | OfficeScan | High 8.8 | 25% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.