Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
Trend Micro, Inc. — TrendAI Apex One
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.
6.7
12.7%
Vector breakdown
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
- Published
- May 21, 2026
- Modified
- May 22, 2026
- Added to KEV
- May 21, 2026
- Federal patch due
- Jun 4, 2026
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2026-34926, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2026-34926 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2026-34926?
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.
How severe is CVE-2026-34926?
CVE-2026-34926 has a CVSS base score of 6.7 out of 10 (CVSS 3.1).
Is CVE-2026-34926 actively exploited in the wild?
Yes. CVE-2026-34926 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added May 21, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-34926?
12.7% - meaning FIRST.org's EPSS model estimates a 12.7% probability this vulnerability will be exploited in the wild within 30 days (96% percentile among all scored CVEs).
What type of vulnerability is CVE-2026-34926?
CVE-2026-34926 is classified under CWE-23 (CWE-23: Relative Path Traversal).
Cross-checked against
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