CVE-2026-34926

What is CVE-2026-34926?

A directory traversal vulnerability in the Apex One (on-premise) server 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. This vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability.

Timeline

• 2026-05-21Published to the U.S. National Vulnerability Database (NVD)
• 2026-05-21Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
• 2026-05-23First covered in a defend.network daily briefing
• 2026-06-04CISA federal remediation deadline (BOD 22-01)
• 2026-07-23NVD record last updated

CISA Known Exploited Vulnerability

Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability

Affected product

Trend Micro Apex One

References

• https://success.trendmicro.com/en-US/solution/KA-0023430
• https://success.trendmicro.com/ja-JP/solution/KA-0022974
• https://jvn.jp/en/vu/JVNVU90583059/
• https://nvd.nist.gov/vuln/detail/CVE-2026-34926
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Referenced in our briefings & reports

• GitHub supply-chain attack, Drupal RCE, AWS GovCloud credential leak (2026-05-23)

Related vulnerabilities

• CVE-2026-76519 – Cisco Secure Email Gateway (same weakness: CWE-23)
• CVE-2026-29201 (same weakness: CWE-23)

Trend Micro: 12 known exploited vulnerabilities (CISA KEV) →