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

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-05-21
• EPSS: 13.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-21 · updated 2026-07-23
• Weakness: CWE-23

Description

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; before 14.0.20731 — fixed in 14.0.0.17079, 14.0.20731

How to fix

Upgrade to a fixed version: Trend Micro Apex One 14.0.0.17079, 14.0.20731. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/vu/JVNVU90583059/
• https://success.trendmicro.com/en-US/solution/KA-0023430
• https://success.trendmicro.com/ja-JP/solution/KA-0022974
• https://www.jpcert.or.jp/english/at/2026/at260014.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926

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