Path Traversal in Trendmicro Apex One
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (44.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.127 · newest: 0.005 · change: -0.121
Affected products
- Trendmicro Apex One
- Trend Micro, Inc. Trendai Apex One — versions 2019 (14.0)
- Trend Micro, Inc. Trendai Apex One As A Service — versions SaaS
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- success.trendmicro.com/en-US/solution/KA-0023430 (Vendor Advisory)
- success.trendmicro.com/ja-JP/solution/KA-0022974 (Vendor Advisory)
- jvn.jp/en/vu/JVNVU90583059/ (Third Party Advisory)
- www.jpcert.or.jp/english/at/2026/at260014.html (Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-34926?
- CVE-2026-34926 is a medium-severity vulnerability in Trendmicro Apex One, classified under Relative Path Traversal. CVSS score: 6.7/10. Published 2026-05-21.
- How severe is CVE-2026-34926?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2026-34926 known to be exploited?
- Yes. CVE-2026-34926 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-21), indicating it is being actively exploited. 1 public proof-of-concept repositories are indexed.