CVE entry · CVE-2026-34926
CVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on May 21, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 4, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Trend Micro Apex One, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (success.trendmicro.com)
- NVD entry (NIST)
- CISA KEV catalog