Exploited vulnerability · CISA KEV

Is CVE-2026-34926 exploited? Yes: in CISA KEV since 21 May 2026

Gociux · Trend Micro Apex One · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-34926, Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 21 May 2026, the day it was published. It affects Trend Micro Apex One. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

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.

What to do

1. Check whether you run it. Look for Apex One in your asset inventory, including appliances and cloud images. Stack check lists every exploited Trend Micro CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 21 May 2026.
4. Get told next time. Email alerts when CISA adds a CVE for Trend Micro.

Other exploited CVEs in Apex One

• CVE-2025-54948: Trend Micro Apex One OS Command Injection Vulnerability (18 Aug 2025)

References

• success.trendmicro.com/en-US/solution/KA-0023430
• nvd.nist.gov/vuln/detail/CVE-2026-34926

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2026 · Trend Micro scorecard · act-now radar.