CVE-2026-34926
Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 June 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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.
- CVSS 3.1
- 6.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
- EPSS
- 12.68% probability · 96th percentile
- CISA KEV
- Listed 21 May 2026 · due 4 June 2026
- Weakness
- CWE-23
- Affected
- trendmicro/apex one
- Source
- security@trendmicro.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://success.trendmicro.com/en-US/solution/KA-0023430 ; https://nvd.nist.gov/vuln/detail/CVE-2026-34926
References
- https://jvn.jp/en/vu/JVNVU90583059/Third Party Advisory
- https://success.trendmicro.com/en-US/solution/KA-0023430Vendor Advisory
- https://success.trendmicro.com/ja-JP/solution/KA-0022974Vendor Advisory
- https://www.jpcert.or.jp/english/at/2026/at260014.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.