CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by trendmicro, published 2026-05-21).
Weakness: CWE-23: Relative Path Traversal
How it can be exploited
Exploitable with local access with high attack complexity needing high privileges and no user interaction. Impact: 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
CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: no. Technical impact: total.
- On CISA KEV since
- 2026-05-21
- US federal deadline
- 2026-06-04
- Ransomware use
- Not known
Public exploit evidence (Exploit Observer)
Also known as: BDU:2026-08141, EUVD-2026-31284, GHSA-4ccp-cqrh-3w9v
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Vulnerability databases and vendor advisories (4)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-31284
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-4ccp-cqrh-3w9v
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34926
- Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926
6 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.134
likely to be attacked soon - VEDAS
- 0.547
some exploit evidence - On CISA KEV
- Yes, since 2026-05-21
- Detection rule
- Out of scope (local)
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Trend Micro, Inc. TrendAI Apex One | from 2019 (14.0) before 14.0.0.17079 | Not stated |
| Trend Micro, Inc. TrendAI Apex One as a Service | from SaaS before 14.0.20731 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: trend_micro apex_one, trend_micro apex_one_as_a_service, trendmicro apex_one.
How to fix it
Fixed versions stated in the CVE record: 14.0.0.17079, 14.0.20731.
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.
Vendor guidance:
- https://success.trendmicro.com/en-US/solution/KA-0023430
- https://nvd.nist.gov/vuln/detail/CVE-2026-34926
How to detect it
This bug needs local access to exploit. VEDAS signatures cover remotely exploitable bugs for now, so there is no network rule or remote check for it. Patch it and watch your endpoint telemetry for unusual local activity.
References
Government sources
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926 (government-resource)
Other references
- https://success.trendmicro.com/en-US/solution/KA-0023430
- https://success.trendmicro.com/ja-JP/solution/KA-0022974
- https://jvn.jp/en/vu/JVNVU90583059/
- https://www.jpcert.or.jp/english/at/2026/at260014.html
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.