Theory what is meant by validating security concerns for these user groups

may help you . could potentially be in really big trouble if you eval()'d something like

<?php
   eval("shell_exec(\"rm -rf {$_SERVER['DOCUMENT_ROOT']}\");");
?>

Hope that helps You might consider looking at AzMan (Authorization Manager).
It can be tied to active directory accounts and completely stored within AD. AzMan provides a lot more fine grained control over Roles and even Actions allowed. In short you would code your apps to test if the user is authorized for particular Actions. When creating Roles you would assign one or more actions to that role.

hope this fix your issue Generally speaking you don't see many CVEs that affect the server side because the server side virtually never runs user provided code (or an attacker's code). The vulnerabilities with server side are mostly failure to properly handle input, and issues with configuration, so not Java's fault.
The client side however (applets being a great example) has lots of CVEs because the user's local JVM is actually running byte code that was provided by the attacker. Vulnerabilities in the JVM can then be triggered and exploited. These same vulnerabilities are usually present on the server side, but they aren't accessible to attackers.

will be helpful for those in need When you are running user-defined regex with user-defined string on your side, it is possible for user to craft a catastrophic backtracking regex, usually with failing input to cause denial of service on your system.
Using your example ^((ab)*)+$, you need a slightly longer, failing input to cause catastrophic backtracking to take effect: "ababababababababababababababababababababababd".

wish of those help There are instructions here, although that gives a user full control of the group (including rights to delete), and has some other issues (like a hard-coded username).
I've modified that example for you to only give GenericWrite permissions, and to accept the username as a parameter. This also assumes the user, group, and computer you're running this on are all on the same domain:

function Set-GroupSecurity {
[CmdletBinding()]
param (
 [string] $GroupName,
 [string] $UserName
)
    $dom = [System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()
    $root = $dom.GetDirectoryEntry()

    $search = [System.DirectoryServices.DirectorySearcher]$root
    $search.Filter = "(&(objectclass=group)(sAMAccountName=$GroupName))"
    $search.SizeLimit = 3000
    $result = $search.FindOne()

    $object = $result.GetDirectoryEntry()

    $sec = $object.ObjectSecurity

    ## set the rights and control type
    $allow = [System.Security.AccessControl.AccessControlType]::Allow
    $read = [System.DirectoryServices.ActiveDirectoryRights]::GenericRead
    $write = [System.DirectoryServices.ActiveDirectoryRights]::GenericWrite

    ## who does this apply to
    $domname = ([ADSI]"").Name
    $who = New-Object -TypeName System.Security.Principal.NTAccount -ArgumentList "$domname", $UserName

    # apply rules
    $readrule = New-Object -TypeName System.DirectoryServices.ActiveDirectoryAccessRule -ArgumentList $who, $read, $allow
    $sec.AddAccessRule($readrule)

    $writerule = New-Object -TypeName System.DirectoryServices.ActiveDirectoryAccessRule -ArgumentList $who, $write, $allow
    $sec.AddAccessRule($writerule)

    # tell it that we're only changing the DACL and not the owner
    $object.get_Options().SecurityMasks = [System.DirectoryServices.SecurityMasks]::Dacl

    # save
    $object.CommitChanges()
}

Set-GroupSecurity -GroupName "TstGroup1" -UserName "someone"