FalehSec Exploited-vulnerability triage · joined from CISA KEV, NVD CVSS and EPSS

CVE-2026-34926

Trend Micro · Apex One · Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability

Verdict
Patch on your normal cycle · actively exploited, not reachable unauthenticated from the internet, and in the upper half of CVEs by near-term exploitation probability

Added to CISA KEV 2026-05-21 · exploited in the wild for 129 days

What an attacker can reach How likely Time What CISA says to do Sources All 545

What an attacker can reach

CVSS 6.7 MEDIUM. The score is a summary; these three components are the part that decides whether something scanning the internet can use it.

Attack vectorlocalrequires local access to the machine
Privileges requiredhighneeds elevated privileges before it can be used
User interactionnonecan be triggered with nobody interacting with the page or request
Base vectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
WeaknessCWE-23

This describes the vulnerability. It says nothing about whether your systems run it.

How likely

EPSS puts the probability of exploitation in the next 30 days at 0.0054, which places it in the upper half of all tracked CVEs. The percentile is the more useful half: 0.18 in absolute terms sounds low until you know most of the internet-facing software in the world scores under that.

EPSS probability0.0054
Percentile0.430 — upper half

Time

Added to KEV2026-05-21
Days exploited129
Federal remediation duenot set
Ransomware useno known ransomware campaign use

What CISA says 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.

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.

Sources