Known exploited vulnerability
CVE-2026-34926
The short answer
CVE-2026-34926 affects Trend Micro, Inc. TrendAI Apex One and is rated medium (CVSS 6.7). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-21: attackers are using it, so patch it first.
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.
Weakness: CWE-23.
Severity
6.7 medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L
Exploited (CISA KEV)
Yes, since May 21, 2026
Federal due date Jun 4, 2026
EPSS, next 30 days
13%
Higher than 96% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- Low
- Availability impact
- Low
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
TrendAI Apex One, TrendAI Apex One as a Service. NVD's record lists the exact affected versions.
References
- jvn.jp/en/vu/JVNVU90583059/ Third Party Advisory
- success.trendmicro.com/en-US/solution/KA-0023430 Vendor Advisory
- success.trendmicro.com/ja-JP/solution/KA-0022974 Vendor Advisory
- www.jpcert.or.jp/english/at/2026/at260014.html Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926 Third Party AdvisoryUS Government Resource
Questions
Is CVE-2026-34926 being exploited?
Yes. CISA added CVE-2026-34926 to its Known Exploited Vulnerabilities catalog on 2026-05-21, with a federal remediation due date of 2026-06-04.
How do I fix CVE-2026-34926?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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