CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 21 May 2026, the same day the CVE record was published.
- How likely is exploitation in the next 30 days?
- 13.4%
EPSS score, percentile 96.4 of all scored records
- How severe?
- 6.7 Medium
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline 4 Jun 2026. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 2019 (14.0) to before 14.0.0.17079
- from SaaS to before 14.0.20731
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by 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.
CISA due date for this action: 4 June 2026.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://success.trendmicro.com/en-US/solution/KA-0023430
- https://nvd.nist.gov/vuln/detail/CVE-2026-34926
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 2019 (14.0) to before 14.0.0.17079 |
| Status | Versions |
|---|---|
| Affected | from SaaS to before 14.0.20731 |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Trend Micro Apex One (on-premise) contains a directory traversal vulnerability that 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.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2026-34926 to its Known Exploited Vulnerabilities (KEV) catalog on 21 May 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 4 Jun 2026.
- The CVE record was published on 21 May 2026, the same day it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 6.7 (Medium), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 13.4% (percentile 96.4), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-23: Relative Path Traversal
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 21 May 2026 | CVE record published |
| 21 May 2026 | Added to CISA KEV |
| 22 May 2026 | CVE record last updated |
| 4 Jun 2026 | CISA due date for the required action |
References
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