Windows 11 integrates multiple telemetry and input subsystems that buffer and analyze keyboard input for accessibility, diagnostics, and security. Typed passwords entered into third-party applications using standard Windows input APIs (e.g., PuTTY, WinSCP, MySQL CLI) can appear in LSASS.exe, ctfmon.exe, Microsoft Defender, and other processes due to shared input buffers and telemetry data flows. LSASS receives telemetry from ETW providers but does not actively read keystrokes. Passwords may remain in ctfmon.exe memory after application exit, which is not a protected process, allowing non-admin malware to potentially extract them. Credential Guard protects Windows authentication secrets but not these third-party passwords. This is a design limitation of Windows input architecture rather than a security vulnerability. Clipboard data can also appear in LSASS memory due to shared memory and secure desktop transitions. Mitigations focus on using secure credential APIs, key-based authentication, and avoiding insecure input methods.

Passwords typed into third-party applications may be exposed in memory of system processes such as LSASS.exe and ctfmon.exe. Non-admin malware could extract passwords from ctfmon.exe memory since it is not a protected process. Credential Guard does not protect these passwords, potentially leading to credential exposure if an attacker has local access or malware is present. LSASS memory dumps may contain non-Windows credentials, complicating incident response. However, no data exfiltration or keylogging APIs are involved, and this behavior is not considered a vulnerability by Microsoft. The risk is primarily from local memory access or malware with privilege escalation.

This behavior is considered expected and not a vulnerability by Microsoft. No official patch or fix is available. To mitigate risks: use secure credential APIs such as Windows Credential UI, Secure Desktop, Windows Hello, or Credential Manager; prefer key-based authentication methods (e.g., SSH keys) and disable password login where possible; avoid typing passwords into standard console or third-party application input fields; use password managers that support secure injection APIs; clear clipboard contents after use; and consider virtualization or dedicated jump hosts to isolate sensitive credential entry. Credential Guard should be enabled to protect Windows authentication secrets but does not protect third-party application passwords. These mitigations reduce exposure but do not eliminate the architectural behavior.