CVE-2026-40400 windows 10 1607 vulnerability
Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.
Quick answer
microsoft windows 10 1607 should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- -
- r2
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-40400 affects Windows 10 1607. The issue is in Windows PowerShell. A successful attacker could run code or commands on the affected system. Install the Microsoft security update for this CVE and restart affected devices.
- Install the latest Microsoft security update that includes a fix for CVE-2026-40400 on every affected Windows 10 1607 system.
- Prioritize internet-facing systems, shared workstations, admin machines, domain systems, and servers that process untrusted files or network traffic.
- Restart the device after patching so the fixed Windows components are loaded.
- If patching must wait, reduce exposure: limit local logons, remove unused roles, block unnecessary inbound access, and keep standard users away from admin rights.
- Watch endpoint, Windows event, and EDR logs for unusual crashes, privilege changes, or access to the affected component until every machine is patched.
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Verify the fix
- Confirm Windows Update, WSUS, Intune, or your patch tool shows the CVE-2026-40400 security update as installed.
- Check a sample device manually with update history or installed hotfix data.
- Run a fresh vulnerability scan and confirm this CVE no longer appears for the patched hosts.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-40400?
microsoft windows 10 1607 versions listed as affected should be reviewed: -, r2.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.