diff --git a/cl_dll/input_goldsource.cpp b/cl_dll/input_goldsource.cpp
index 80a0ab5e..d3517b28 100644
--- a/cl_dll/input_goldsource.cpp
+++ b/cl_dll/input_goldsource.cpp
@@ -1592,7 +1592,7 @@ void GoldSourceInput::IN_Init (void)
 {
 	ignoreNextDelta = false;
 	m_filter				= gEngfuncs.pfnRegisterVariable ( "m_filter","0", FCVAR_ARCHIVE );
-	sensitivity			 = gEngfuncs.pfnRegisterVariable ( "sensitivity","3", FCVAR_ARCHIVE ); // user mouse sensitivity setting.
+	sensitivity			 = gEngfuncs.pfnRegisterVariable ( "sensitivity","3", FCVAR_ARCHIVE | FCVAR_FILTERSTUFFTEXT ); // user mouse sensitivity setting.
 
 	in_joystick			 = gEngfuncs.pfnRegisterVariable ( "joystick","0", FCVAR_ARCHIVE );
 	joy_name				= gEngfuncs.pfnRegisterVariable ( "joyname", "joystick", 0 );
diff --git a/cl_dll/input_xash3d.cpp b/cl_dll/input_xash3d.cpp
index ba5b14fd..4f2ea39f 100644
--- a/cl_dll/input_xash3d.cpp
+++ b/cl_dll/input_xash3d.cpp
@@ -280,7 +280,7 @@ void FWGSInput::IN_Shutdown( void )
 // Register cvars and reset data
 void FWGSInput::IN_Init( void )
 {
-	sensitivity = gEngfuncs.pfnRegisterVariable( "sensitivity", "3", FCVAR_ARCHIVE );
+	sensitivity = gEngfuncs.pfnRegisterVariable( "sensitivity", "3", FCVAR_ARCHIVE | FCVAR_FILTERSTUFFTEXT );
 	in_joystick = gEngfuncs.pfnRegisterVariable( "joystick", "0", FCVAR_ARCHIVE );
 	cl_laddermode = gEngfuncs.pfnRegisterVariable( "cl_laddermode", "2", FCVAR_ARCHIVE );
 	ac_forwardmove = ac_sidemove = rel_yaw = rel_pitch = 0;
diff --git a/common/cvardef.h b/common/cvardef.h
index 1d55f7ca..4ab46a50 100644
--- a/common/cvardef.h
+++ b/common/cvardef.h
@@ -26,6 +26,10 @@
 #define FCVAR_PRINTABLEONLY	(1<<7)	// This cvar's string cannot contain unprintable characters ( e.g., used for player name etc ).
 #define FCVAR_UNLOGGED	(1<<8)	// If this is a FCVAR_SERVER, don't log changes to the log file / console if we are creating a log
 #define FCVAR_NOEXTRAWHITEPACE (1<<9)  // strip trailing/leading white space from this cvar
+#define FCVAR_PRIVILEGED	(1<<10)	// Not queryable/settable by unprivileged sources
+#define FCVAR_FILTERSTUFFTEXT	(1<<11)	// Not queryable/settable if unprivileged and filterstufftext is enabled
+#define FCVAR_FILTERCHARS	(1<<12) // This cvar's string will be filtered for 'bad' characters (e.g. ';', '\n')
+#define FCVAR_NOBADPATHS	(1<<13) // This cvar's string cannot contain file paths that are above the current directory
 
 typedef struct cvar_s
 {