CVE-2026-34926
Actively exploited. CVE-2026-34926 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-21) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-34926 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- 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.
- Who is affected
- Users of Trend Micro Apex One (on-premise) installations.
- Urgency
- Remediation is critical due to the potential for code injection and active exploitation.
- Action
- Users should apply the latest security updates for Trend Micro Apex One.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 96% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-34926 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (2)
- unknownexploitedSecurity Alert: [Updated] Alert Regarding Multiple Vulnerabilities in Trend Micro Products Including TrendAI A…jpcert · 2026-05-22
- criticalexploitedCVE-2026-34926: Trend Micro Apex One (On-Premise) Directory Traversal Vulnerabilitycisa-kev · 2026-05-21
External references
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[](https://www.csirts.com/cve/CVE-2026-34926)