CVE-2026-34926 — Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Confirmed exploitation (CISA KEV)+35
- Public exploit/PoC (github)+6
- EPSS 0.5% (30-day exploitation probability)+7
- Technical severity (medium)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
CISA required action CISA
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal deadline: Jun 4, 2026 — passed 133 day(s) ago
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Trend Micro, Inc. Apex One, Trend Micro, Inc. TrendAI Apex One, Trend Micro, Inc. TrendAI Apex One as a Service).
- Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Trend Micro, Inc. | Apex One | < 14.0.0.17079< 14.0.20731 | Vulnerable | NIST National Vulnerability Database |
| Trend Micro, Inc. | TrendAI Apex One | ≥ 2019 (14.0) and < 14.0.0.17079 | Vulnerable | CVE Program (cve.org) e CISA ADP |
| Trend Micro, Inc. | TrendAI Apex One as a Service | ≥ SaaS and < 14.0.20731 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 6.7 | CVSS 3.1 | Medium | 0.8 | 5.3 | security@trendmicro.com via NIST National Vulnerability Database |
| 6.7 | CVSS 3.1 | Medium | — | — | GitHub, Inc. via GitHub Security Advisories |
| 6.7 | CVSS 3.1 | Medium | — | — | trendmicro via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L (score shown at the top: security@trendmicro.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CISA KEV details CISA
CISA lists a CVE once it has evidence of exploitation against real targets.
CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.
Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
- CVE-2026-34926 ★ 0 May 22, 2026
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
EPSS over time FIRST
Oct 12, 2026 → Oct 14, 2026 · 3 reading(s) · max 0.54%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
- Monitor file creation in web directories and paths with traversal sequences (../).
- Hunt retroactively in logs from before May 21, 2026 (KEV listing): exploitation may have started earlier.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · trend micro, inc./trendai apex one, trend micro, inc./trendai apex one as a service
- SSVC assessment updated
- Record published
- Affected products added · trendmicro/apex one
- CVSS changed · 6.7
- Source status changed · → Analyzed
- Added to CISA KEV (detected)
- Record created in this database
- CVE published
- Added to CISA KEV catalog
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 13, 2026 – Oct 13, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
8 on the record
- success.trendmicro.com/en-US/solution/KA-0023430
- success.trendmicro.com/ja-JP/solution/KA-0022974
- jvn.jp/en/vu/JVNVU90583059/
- www.cisa.gov/known-exploited-vulnerabilities-catalog
- nvd.nist.gov/vuln/detail/CVE-2026-34926
- github.com/advisories/GHSA-4ccp-cqrh-3w9v
- jvn.jp/en/vu/JVNVU90583059
- www.jpcert.or.jp/english/at/2026/at260014.html
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-45208 TOCTOU Race Condition in Trend Micro, Inc. Apex One May 21, 2026
- High CVE-2026-45207 An origin validation vulnerability in the Apex One/SEP agent could allow a local… May 21, 2026
- High CVE-2026-45206 An origin validation vulnerability in the Apex One/SEP agent could allow a local… May 21, 2026
- High CVE-2026-34928 An origin validation vulnerability in the Apex One/SEP agent could allow a local… May 21, 2026
- High CVE-2026-34927 An origin validation vulnerability in the Apex One/SEP agent could allow a local… May 21, 2026
- High CVE-2026-34929 An origin validation vulnerability in the Apex One/SEP agent could allow a local… May 21, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-34926 is "Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability", rated Medium. It affects Apex One (Trend Micro, Inc.); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 6.7 describes technical severity. EPSS 0.54% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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