diff --git a/code/game/machinery/PDApainter.dm b/code/game/machinery/PDApainter.dm
index 16a6615497c..bd2ca0ad37c 100644
--- a/code/game/machinery/PDApainter.dm
+++ b/code/game/machinery/PDApainter.dm
@@ -347,7 +347,7 @@
 
 			var/selection = params["selection"]
 			for(var/path in card_trims)
-				if(!(card_trims[path] == selection))
+				if(card_trims[path] != selection)
 					continue
 
 				if(SSid_access.apply_trim_to_card(stored_id_card, path, copy_access = FALSE))
diff --git a/code/game/machinery/computer/apc_control.dm b/code/game/machinery/computer/apc_control.dm
index fdebf44e52a..89211371361 100644
--- a/code/game/machinery/computer/apc_control.dm
+++ b/code/game/machinery/computer/apc_control.dm
@@ -188,7 +188,10 @@
 			var/ref = params["ref"]
 			playsound(src, SFX_TERMINAL_TYPE, 50, FALSE)
 			var/obj/machinery/power/apc/remote_target = locate(ref) in SSmachines.get_machines_by_type_and_subtypes(/obj/machinery/power/apc)
+			if(!remote_target || !check_apc(remote_target))
+				return
 			connect_apc(remote_target, user)
+			return TRUE
 		if("check-logs")
 			log_activity("Checked Logs")
 		if("check-apcs")
@@ -198,13 +201,19 @@
 			var/type = params["type"]
 			var/value = params["value"]
 			var/obj/machinery/power/apc/target = locate(ref) in SSmachines.get_machines_by_type_and_subtypes(/obj/machinery/power/apc)
-			if(!target)
+			if(!target || !check_apc(target))
 				return
 
 			value = target.setsubsystem(text2num(value))
 			switch(type) // Sanity check
-				if("equipment", "lighting", "environ")
-					target.vars[type] = value
+				if("equipment")
+					target.equipment = value
+				if("lighting")
+					target.lighting = value
+				if("environ")
+					target.environ = value
+				if(null)
+					return
 				else
 					message_admins("Warning: possible href exploit by [key_name(user)] - attempted to set [html_encode(type)] on [target] to [html_encode(value)]")
 					user.log_message("possibly trying to href exploit - attempted to set [html_encode(type)] on [target] to [html_encode(value)]", LOG_ADMIN)
@@ -227,9 +236,12 @@
 		if("breaker")
 			var/ref = params["ref"]
 			var/obj/machinery/power/apc/breaker_target = locate(ref) in SSmachines.get_machines_by_type_and_subtypes(/obj/machinery/power/apc)
+			if(!breaker_target || !check_apc(breaker_target))
+				return
 			breaker_target.toggle_breaker(user)
 			var/setTo = breaker_target.operating ? "On" : "Off"
 			log_activity("Turned APC [breaker_target.area.name]'s breaker [setTo]")
+			return TRUE
 
 /obj/machinery/computer/apc_control/ui_close(mob/user)
 	. = ..()
diff --git a/code/game/machinery/launch_pad.dm b/code/game/machinery/launch_pad.dm
index 6db5f9d4f15..1705a4241fb 100644
--- a/code/game/machinery/launch_pad.dm
+++ b/code/game/machinery/launch_pad.dm
@@ -429,11 +429,13 @@
 		if("set_pos")
 			var/new_x = text2num(params["x"])
 			var/new_y = text2num(params["y"])
+			// sanitizes our ranges for us
 			our_pad.set_offset(new_x, new_y)
 			. = TRUE
 		if("move_pos")
 			var/plus_x = text2num(params["x"])
 			var/plus_y = text2num(params["y"])
+			// sanitizes our ranges for us
 			our_pad.set_offset(
 				x = our_pad.x_offset + plus_x,
 				y = our_pad.y_offset + plus_y
@@ -441,7 +443,7 @@
 			. = TRUE
 		if("rename")
 			. = TRUE
-			var/new_name = params["name"]
+			var/new_name = reject_bad_name(params["name"], allow_numbers = TRUE, max_length = MAX_NAME_LEN, cap_after_symbols = FALSE)
 			if(!new_name)
 				return
 			our_pad.display_name = new_name
diff --git a/code/game/machinery/limbgrower.dm b/code/game/machinery/limbgrower.dm
index dc6647f4d3e..f3d8e236c73 100644
--- a/code/game/machinery/limbgrower.dm
+++ b/code/game/machinery/limbgrower.dm
@@ -202,7 +202,12 @@
 
 		if("make_limb")
 			var/design_id = params["design_id"]
-			if(!stored_research.researched_designs.Find(design_id) && !stored_research.hacked_designs.Find(design_id) && !imported_designs.Find(design_id))
+			var/temp_category = params["active_tab"]
+			if(!stored_research.researched_designs[design_id] && !stored_research.hacked_designs[design_id] && !imported_designs[design_id])
+				return
+			if(!(obj_flags & EMAGGED) && stored_research.hacked_designs.Find(design_id))
+				return
+			if(!(temp_category in categories))
 				return
 			being_built = SSresearch.techweb_design_by_id(design_id)
 			// All the reagents we're using to make our organ.
@@ -223,9 +228,6 @@
 			use_energy(power)
 			flick("limbgrower_fill", src)
 			icon_state = "limbgrower_idleon"
-			var/temp_category = params["active_tab"]
-			if( ! (temp_category in categories) )
-				return FALSE //seriously come on
 			selected_category = temp_category
 			addtimer(CALLBACK(src, PROC_REF(build_item), consumed_reagents_list), production_speed * production_coefficient)
 			return TRUE
diff --git a/code/game/machinery/modular_shield.dm b/code/game/machinery/modular_shield.dm
index 2e8fa632e42..8cef5211c98 100644
--- a/code/game/machinery/modular_shield.dm
+++ b/code/game/machinery/modular_shield.dm
@@ -284,7 +284,7 @@
 		if ("set_radius")
 			if (active)
 				return
-			var/change_radius = max(1,(text2num(params["new_radius"])))
+			var/change_radius = clamp(text2num(params["new_radius"]), 1, max_radius)
 			if(change_radius >= 10)
 				radius = round(change_radius)//if its over 10 we don't allow decimals
 				return
diff --git a/code/game/machinery/scanner_gate.dm b/code/game/machinery/scanner_gate.dm
index b4d7357d58b..3c003a8dfa6 100644
--- a/code/game/machinery/scanner_gate.dm
+++ b/code/game/machinery/scanner_gate.dm
@@ -41,7 +41,7 @@
 	///Base false positive/negative chance
 	var/base_false_beep = 5
 	///List of species that can be scanned by the gate. Supports adding more species' IDs during in-game.
-	var/list/available_species = list(
+	var/static/list/available_species = list(
 		SPECIES_HUMAN,
 		SPECIES_LIZARD,
 		SPECIES_FLYPERSON,
@@ -53,6 +53,31 @@
 		SPECIES_GOLEM,
 		SPECIES_ZOMBIE,
 	)
+	/// All scan modes available to the scanner
+	var/static/list/all_modes = list(
+		SCANGATE_NONE,
+		SCANGATE_MINDSHIELD,
+		SCANGATE_DISEASE,
+		SCANGATE_GUNS,
+		SCANGATE_WANTED,
+		SCANGATE_SPECIES,
+		SCANGATE_NUTRITION,
+	)
+	/// All disease severity thresholds available to the scanner
+	var/static/list/all_disease_thresholds = list(
+		DISEASE_SEVERITY_POSITIVE,
+		DISEASE_SEVERITY_NONTHREAT,
+		DISEASE_SEVERITY_MINOR,
+		DISEASE_SEVERITY_MEDIUM,
+		DISEASE_SEVERITY_HARMFUL,
+		DISEASE_SEVERITY_DANGEROUS,
+		DISEASE_SEVERITY_BIOHAZARD,
+	)
+	/// All nutrition levels available to the scanner
+	var/static/list/nutrition_modes = list(
+		"Starving",
+		"Obese",
+	)
 	/// Overlay object we're using for scanlines
 	var/obj/effect/overlay/scanline = null
 
@@ -304,6 +329,8 @@
 	switch(action)
 		if("set_mode")
 			var/new_mode = params["new_mode"]
+			if(!new_mode || !(new_mode in all_modes))
+				return
 			scangate_mode = new_mode
 			. = TRUE
 		if("toggle_reverse")
@@ -315,26 +342,25 @@
 			. = TRUE
 		if("set_disease_threshold")
 			var/new_threshold = params["new_threshold"]
+			if(!new_threshold || !(new_threshold in all_disease_thresholds))
+				return
 			disease_threshold = new_threshold
 			. = TRUE
 		if("set_target_species")
 			var/new_specie_id = params["new_species_id"]
-			if(!(new_specie_id in available_species))
+			if(!new_specie_id || !(new_specie_id in available_species))
 				return
 			detect_species_id = new_specie_id
 			. = TRUE
 		if("set_target_nutrition")
 			var/new_nutrition = params["new_nutrition"]
-			var/nutrition_list = list(
-				"Starving",
-				"Obese"
-			)
-			if(new_nutrition && (new_nutrition in nutrition_list))
-				switch(new_nutrition)
-					if("Starving")
-						detect_nutrition = NUTRITION_LEVEL_STARVING
-					if("Obese")
-						detect_nutrition = NUTRITION_LEVEL_FAT
+			if(!new_nutrition || !(new_nutrition in nutrition_modes))
+				return
+			switch(new_nutrition)
+				if("Starving")
+					detect_nutrition = NUTRITION_LEVEL_STARVING
+				if("Obese")
+					detect_nutrition = NUTRITION_LEVEL_FAT
 			. = TRUE
 		//SKYRAT EDIT BEGIN - MORE SCANNER GATE OPTIONS
 		if("set_target_gender")
diff --git a/code/game/objects/items/airlock_painter.dm b/code/game/objects/items/airlock_painter.dm
index 219dfd42084..43768f88499 100644
--- a/code/game/objects/items/airlock_painter.dm
+++ b/code/game/objects/items/airlock_painter.dm
@@ -306,16 +306,24 @@
 	switch(action)
 		//Lists of decals and designs
 		if("select decal")
-			var/selected_decal = params["decal"]
-			var/selected_dir = text2num(params["dir"])
-			stored_decal = selected_decal
-			stored_dir = selected_dir
+			. = TRUE
+			for(var/decal_set in decal_list)
+				if(decal_set[2] == params["decal"])
+					stored_decal = params["decal"]
+					break
+			for(var/dir_set in dir_list)
+				if(dir_set[2] == text2num(params["dir"]))
+					stored_dir = text2num(params["dir"])
+					break
+
 		if("select color")
-			var/selected_color = params["color"]
-			stored_color = selected_color
+			. = TRUE
+			stored_color = params["color"]
+
 		if("pick custom color")
 			if(supports_custom_color)
 				pick_painting_tool_color(usr, stored_custom_color)
+
 	update_decal_path()
 	. = TRUE