# CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal

> A local attacker with administrative credentials can exploit a directory traversal flaw in the on-premise Apex One server to inject malicious code deployed to agents.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L`)
- **Exploited in the wild:** Yes, since 21 May 2026 (CISA KEV)
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 May 2026
- **Updated:** 22 May 2026
- **Also known as:** GHSA-4ccp-cqrh-3w9v

## What is CVE-2026-34926?

CVE-2026-34926 is a medium-severity path traversal vulnerability in Trendmicro Apex One, published on 21 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2026-34926?

It affects 1 product.


Products: Trendmicro Apex One.

## How do I fix CVE-2026-34926?

No fix has been published for CVE-2026-34926 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 4 Jun 2026.

## Is CVE-2026-34926 being exploited?

Yes. Attackers have exploited CVE-2026-34926 in the wild since at least 21 May 2026.

Public exploit code:

- CVE-2026-34926 (github_poc): https://github.com/HORKimhab/CVE-2026-34926

## Other vulnerabilities in Trendmicro Apex One

- [CVE-2020-8599](https://insights.sbomify.com/CVE-2020-8599/): Trend Micro Apex One and OfficeScan Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2025-54948](https://insights.sbomify.com/CVE-2025-54948/): Trend Micro Apex One OS Command Injection (critical 9.4, exploited in the wild)
- [CVE-2021-36741](https://insights.sbomify.com/CVE-2021-36741/): Trend Micro Multiple Products Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2020-8467](https://insights.sbomify.com/CVE-2020-8467/): Trend Micro Apex One and OfficeScan Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2020-8468](https://insights.sbomify.com/CVE-2020-8468/): Trend Micro Multiple Products Content Validation Escape (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34926 and fix it if it is affected.

What it is: CVE-2026-34926 is a medium-severity path traversal vulnerability in Trendmicro Apex One, published on 21 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-34926 in the wild since at least 21 May 2026.

Affected product: Trendmicro Apex One. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34926/ (Markdown: https://insights.sbomify.com/CVE-2026-34926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34926
- OSV: https://osv.dev/vulnerability/CVE-2026-34926

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-34926/
Summaries are generated and may contain mistakes; the official description above is the record.