CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- 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.
- Who is affected
- Users of Trend Micro Apex One (on-premise) installations.
- Urgency
- Remediation is critical due to the potential for code injection and active exploitation.
- Action
- Users should apply the latest security updates for Trend Micro Apex One.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-34926
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-34926Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 96% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-34926 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Trend Micro Apex
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownexploitedSecurity Alert: [Updated] Alert Regarding Multiple Vulnerabilities in Trend Micro Products Including TrendAI A…jpcert · 2026-05-22
- criticalexploitedCVE-2025-54948: Trend Micro Apex One OS Command Injection Vulnerabilitycisa-kev · 2025-08-18
- criticalexploitedCVE-2023-41179: Trend Micro Apex One and Worry-Free Business Security Remote Code Execution Vulnerabilitycisa-kev · 2023-09-21
- criticalexploitedCVE-2022-40139: Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerabilitycisa-kev · 2022-09-15
- criticalexploitedCVE-2022-26871: Trend Micro Apex Central Arbitrary File Upload Vulnerabilitycisa-kev · 2022-03-31
- criticalexploitedCVE-2020-8467: Trend Micro Apex One and OfficeScan Remote Code Execution Vulnerabilitycisa-kev · 2021-11-03
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