diff --git a/src/backend/commands/session/join_session.cpp b/src/backend/commands/session/join_session.cpp
new file mode 100644
index 00000000..b75a0e29
--- /dev/null
+++ b/src/backend/commands/session/join_session.cpp
@@ -0,0 +1,89 @@
+#include "backend/command.hpp"
+#include "util/session.hpp"
+
+namespace big
+{
+	class switch_session : command
+	{
+		std::unordered_map<eSessionType, const char*> m_session_types = {
+		    {eSessionType::JOIN_PUBLIC, "PUB"},
+		    {eSessionType::NEW_PUBLIC, "NEWPUB"},
+		    {eSessionType::CLOSED_CREW, "CLOSEDCREW"},
+		    {eSessionType::CREW, "NEWCREW"},
+		    {eSessionType::CLOSED_FRIENDS, "CLOSEDFRIENDS"},
+		    {eSessionType::FIND_FRIEND, "FRIENDS"},
+		    {eSessionType::SOLO, "SOLO"},
+		    {eSessionType::INVITE_ONLY, "INVITE"},
+		    {eSessionType::JOIN_CREW, "CREW"},
+		    {eSessionType::SC_TV, "SCTV"},
+		    {eSessionType::LEAVE_ONLINE, "SINGLEPLAYER"},
+		};
+
+		using command::command;
+
+		std::string valid_args(bool was_session_string = false)
+		{
+			std::string valid_args;
+			if (was_session_string)
+			{
+				for (const auto& session_type_string : m_session_types | std::ranges::views::values)
+				{
+					if (!empty(valid_args))
+					{
+						valid_args += ", ";
+					}
+					valid_args += session_type_string;
+				}
+
+				return valid_args;
+			}
+
+			for (const auto& session_type_id : m_session_types | std::ranges::views::keys)
+			{
+				if (!empty(valid_args))
+				{
+					valid_args += ", ";
+				}
+				valid_args += std::to_string(static_cast<int>(session_type_id));
+			}
+
+			return valid_args;
+		}
+
+		virtual std::optional<command_arguments> parse_args(const std::vector<std::string>& args, const std::shared_ptr<command_context> ctx) override
+		{
+			command_arguments result(1);
+			auto sessionType = static_cast<eSessionType>(std::atoi(args[0].c_str()));
+			if (m_session_types.find(sessionType) == m_session_types.end())
+			{
+				ctx->report_error(std::format("Invalid session type ID given \"{}\", valid inputs are [{}].", args[0], valid_args()));
+
+				return std::nullopt;
+			}
+
+			if (sessionType == eSessionType::JOIN_PUBLIC && args[0] != "0")
+			{
+				const auto it = std::find_if(m_session_types.begin(), m_session_types.end(), [&args](const std::pair<eSessionType, const char*>& t) -> bool {
+					return t.second == args[0];
+				});
+				if (it == m_session_types.end())
+				{
+					ctx->report_error(std::format("Unknown session type \"{}\", valid inputs are [{}].", args[0], valid_args(true)));
+
+					return std::nullopt;
+				}
+
+				sessionType = it->first;
+			}
+
+			result.push<eSessionType>(sessionType);
+			return result;
+		}
+
+		virtual void execute(const command_arguments& args, const std::shared_ptr<command_context> ctx) override
+		{
+			session::join_type(args.shift<eSessionType>());
+		}
+	};
+	switch_session g_switch_session("joinsession", "Join Session", "Join a specific session type.", 1);
+}
\ No newline at end of file
diff --git a/src/backend/commands/session/wipe_session.cpp b/src/backend/commands/session/wipe_session.cpp
index 343e86c8..112dc715 100644
--- a/src/backend/commands/session/wipe_session.cpp
+++ b/src/backend/commands/session/wipe_session.cpp
@@ -1,4 +1,4 @@
-#include "backend/player_command.hpp"
+#include "backend/command.hpp"
 #include "network/CNetworkPlayerMgr.hpp"
 #include "pointers.hpp"
 #include "services/players/player_service.hpp"
diff --git a/src/file_manager.cpp b/src/file_manager.cpp
index e9e03cf0..540e5c8d 100644
--- a/src/file_manager.cpp
+++ b/src/file_manager.cpp
@@ -18,7 +18,9 @@ namespace big
 	file file_manager::get_project_file(std::filesystem::path file_path)
     {
         if (file_path.is_absolute())
-            throw std::exception("Project files are relative to the BaseDir, don't use absolute paths!");
+            throw std::invalid_argument("Project files are relative to the BaseDir, don't use absolute paths!");
+        if (file_path.string().contains(".."))
+			throw std::invalid_argument("Relative path traversal is not allowed, refrain from using \"..\" in file paths.");
 
         return file_manager::ensure_file_can_be_created(m_base_dir / file_path);
     }
@@ -26,7 +28,9 @@ namespace big
 	folder file_manager::get_project_folder(std::filesystem::path folder_path)
     {
         if (folder_path.is_absolute())
-            throw std::exception("Project folders are relative to the BaseDir, don't use absolute paths!");
+            throw std::invalid_argument("Project folders are relative to the BaseDir, don't use absolute paths!");
+        if (folder_path.string().contains(".."))
+			throw std::invalid_argument("Relative path traversal is not allowed, refrain from using \"..\" in folder paths.");
 
         return file_manager::ensure_folder_exists(m_base_dir / folder_path);
     }
diff --git a/src/file_manager/folder.cpp b/src/file_manager/folder.cpp
index e0adf19d..d21557fa 100644
--- a/src/file_manager/folder.cpp
+++ b/src/file_manager/folder.cpp
@@ -12,7 +12,9 @@ namespace big
 	file folder::get_file(std::filesystem::path file_path) const
 	{
 		if (file_path.is_absolute())
-			throw std::exception("folder#get_file requires a relative path.");
+			throw std::invalid_argument("folder#get_file requires a relative path.");
+		if (file_path.string().contains(".."))
+			throw std::invalid_argument("Relative path traversal is not allowed, refrain from using \"..\" in file paths.");
 
 		return file(m_folder_path / file_path);
 	}