NOTE: This issue was only validated on Linux (RHEL7) but could potentially be an issue on Windows as well, depending on how the history file is stored/used.

Install pwsh, and perform an ls -l on the following file:

~/.local/share/powershell/PSReadLine/ConsoleHost_history.txt

Only the owner should have access to read this file.  In it's current configuration, in addition to the owner, both group/everyone can also read this file.  Due to the content of this file, only the owner should have read rights by default.  With the current permission structure, a threat actor could read/replay the command history and use it for malicious purposes.  

The CHMOD file map should be set to 700 or 600 by default.

By default the CHMOD access map on this file is: 664

The above file map grants the owner R/W, the group R/W, and everyone R.

> Name                           Value
----                           -----
PSVersion                      6.0.0
PSEdition                      Core
GitCommitId                    v6.0.0
OS                             Linux 3.10.0-693.11.6.el7.x86_64 #1 SMP Thu Dec 28 14:23:39 EST 2017
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0