CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability

Added to the CISA Known Exploited Vulnerabilities catalog on 21 May 2026. Vendor: Trend Micro. Product: Apex One.

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.

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. (due 04 Jun 2026)