Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability (CVE-2026-34926)
Severity: medium · Patch status: unknown · Since 2026-05-21 · CVE-2026-34926
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. CISA added CVE-2026-34926 to its Known Exploited Vulnerabilities catalog on May 21, 2026, which means attackers are exploiting it in the wild.
What 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.
- US federal agencies must remediate by Jun 4, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
