CVE-2026-34926

Exp

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.

Published: 2026-05-21 Last update: 2026-05-21 Assigner: [email protected] Source: [email protected]
NVD Status：Undergoing Analysis，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34926 is rated Active Exploitation (73.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.11%). CISA KEV confirms active exploitation (added 2026-05-21) affecting Trend Micro / Apex One. a weakness (CWE-23) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2026-34926

Name: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability · CISA KEV detail

Exploit added: 2026-05-21

Action due: 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.

Exploit prediction scoring system (EPSS) score for CVE-2026-34926

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.02% 1.11% +0.09%
2 2026-05-31 0.75% 1.02% +0.27%
3 2026-05-27 — 0.75% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34926

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.7 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 0.8 5.3 [email protected]

Weakness enumeration for CVE-2026-34926

GitHub Security Advisory for CVE-2026-34926

GHSA-4ccp-cqrh-3w9v · Severity: medium — A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre...

Affected software / configurations for CVE-2026-34926

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-34926

cvelogic Threat Intelligence