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CISA KEV Alert — Active Real-World Exploitation Confirmed
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog and is being actively exploited right now.
Trend Micro Apex One Directory Traversal RCE (CVE-2026-34926) | MSSP Advisory
Critical🔴 KEV ALERT
DateMay 21, 2026
CVECVE-2026-34926
📋Executive Summary
CISA added CVE-2026-34926 to the Known Exploited Vulnerabilities catalog targeting Trend Micro Apex One on-premise deployments. Attackers with local access can manipulate agent deployment mechanisms to push malicious code across entire client networks.
⚠️Why It Matters for MSSPs
Your RMM and security stack likely interface with Apex One installations across multiple client environments, creating a pathway for lateral movement between your managed networks. Clients running Apex One expect you to know about threats to their endpoint protection before they become incidents.
✅Recommended Action
Audit all client Apex One deployments within 24 hours and verify vendor patches are applied immediately. Contact clients with on-premise Apex One installations to confirm their patch status and document your advisory in writing.
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🏷️Threat Category
Vulnerability Disclosure
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