Actively exploited · Published May 21, 2026 · Assigned by trendmicro
CVE-2026-34926
Medium 6.7 Exploited
In plain English
A medium-severity security flaw in TrendAI Apex One from Trend Micro, Inc.. Attackers are actively exploiting it in the wild (listed by CISA on May 21, 2026). The chance it is exploited in the next 30 days is estimated at 13.4% (higher than 96% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. 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 guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Jun 4, 2026.
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Trend Micro, Inc. | TrendAI Apex One | 2019 (14.0) – before 14.0.0.17079 |
| Trend Micro, Inc. | TrendAI Apex One as a Service | SaaS – before 14.0.20731 |
Weakness: CWE-23 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
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
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926 government-resource