CVE-2026-34926 Trend Micro Apex One: file path flaw
In plain words: The program can be tricked into reading or writing files outside the folder it should stay in. Leaks files such as passwords and settings, or overwrites important ones.
Confirmed exploited by CISA on · US federal patch deadline Jun 4, 2026
What to do
- Install Trend Micro's security update for Apex One. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability
- Product
- Trend Micro Apex One
- CISA description
- 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.
- Type of flaw
- File path flaw (CWE-23)
- Confirmed exploited
- May 21, 2026
- US federal patch deadline
- Jun 4, 2026
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Answering about CVE-2026-34926 ·
Questions about CVE-2026-34926
Is CVE-2026-34926 being exploited?
Yes. CISA added CVE-2026-34926 to its Known Exploited Vulnerabilities catalog on May 21, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-34926?
Install Trend Micro's security update for Apex One. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2026-34926?
Only if you use Trend Micro Apex One. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.