Zero-day vulnerability in Apex One

Relative Path Traversal
CVE-2026-34926

Vulnerability details

Advisory: SB2026052201 - Multiple vulnerabilities in Trend Micro Apex One

Vulnerable component: Apex One

CVE-ID: CVE-2026-34926

CVSSv3 score: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:L/E:H/RL:O/RC:C

CWE-ID: CWE-23 - Relative Path Traversal

Description:

The vulnerability allows a local privileged user to inject malicious code for deployment to agents.

The vulnerability exists due to path traversal in the Apex One server when accessing server directories. A local privileged user can modify a key table on the server to inject malicious code for deployment to agents.

This issue is only exploitable on on-premise Apex One installations.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://success.trendmicro.com/en-US/solution/KA-0023430

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.