Pre-Authenticated Local Attackers Can Use Relative Path Traversal in Trend Micro Apex One to Modify Key Configuration Data; CISA's June 4th KEV Mandate for Covered Entities Has Lapsed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2026-34926

Key Details

CVE	CVE-2026-34926
Vulnerability Name	Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
Affected products	Trend Micro Apex One
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-23 (Relative Path Traversal)
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-05-21.
Exploitation prediction (EPSS)	0.54% probability of exploitation in the next 30 days (43% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-06-04 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Trend Micro	Apex One

Vendor

Product

Affected Versions

Patch Status

Trend Micro

Apex One

Subsystems	General OT
Sectors	Multiple

What to Know

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

Monitor Trend Micro's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-34926
CVE	https://www.cve.org/CVERecord?id=CVE-2026-34926

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-34926

CVE

https://www.cve.org/CVERecord?id=CVE-2026-34926

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-05-21
Required Action Due Date	2026-06-04
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-05-21

Required Action Due Date

2026-06-04

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.