diff --git a/rpcs3/Crypto/unedat.cpp b/rpcs3/Crypto/unedat.cpp
index 728b6fc9fe..cc577392cb 100644
--- a/rpcs3/Crypto/unedat.cpp
+++ b/rpcs3/Crypto/unedat.cpp
@@ -839,7 +839,7 @@ bool EDATADecrypter::ReadHeader()
 		// Type 2: Use key from RAP file (RIF key). (also used for type 1 at the moment)
 		else 
 		{
-			const std::string rap_path = rpcs3::utils::get_rap_file_path(npdHeader.content_id);
+			const std::string rap_path = rpcs3::utils::get_rap_file_path(npdHeader.get_content_id());
 
 			if (fs::file rap{rap_path}; rap && rap.size() >= sizeof(dec_key))
 			{
diff --git a/rpcs3/Crypto/unedat.h b/rpcs3/Crypto/unedat.h
index e049c44aa9..bebe77799b 100644
--- a/rpcs3/Crypto/unedat.h
+++ b/rpcs3/Crypto/unedat.h
@@ -49,6 +49,12 @@ struct NPD_HEADER
 	u8 dev_hash[0x10];
 	s64 activate_time;
 	s64 expire_time;
+
+	std::string get_content_id() const
+	{
+		const std::string_view id{content_id, sizeof(content_id)};
+		return std::string{id.substr(0, id.find_first_of('\0'))};
+	}
 };
 
 struct EDAT_HEADER
diff --git a/rpcs3/Crypto/unself.cpp b/rpcs3/Crypto/unself.cpp
index e6b166da24..fe4f8e3f6f 100644
--- a/rpcs3/Crypto/unself.cpp
+++ b/rpcs3/Crypto/unself.cpp
@@ -323,7 +323,7 @@ void supplemental_header::Show() const
 		self_log.notice("Version: 0x%08x", PS3_npdrm_header.npd.version);
 		self_log.notice("License: 0x%08x", PS3_npdrm_header.npd.license);
 		self_log.notice("Type: 0x%08x", PS3_npdrm_header.npd.type);
-		self_log.notice("ContentID: %s", PS3_npdrm_header.npd.content_id);
+		self_log.notice("ContentID: %s", PS3_npdrm_header.npd.get_content_id());
 		self_log.notice("Digest: %s", PS3_npdrm_header.npd.digest);
 		self_log.notice("Inverse digest: %s", PS3_npdrm_header.npd.title_hash);
 		self_log.notice("XOR digest: %s", PS3_npdrm_header.npd.dev_hash);
@@ -1065,7 +1065,7 @@ bool SELFDecrypter::DecryptNPDRM(u8 *metadata, u32 metadata_size)
 	if (npd->license == 1)  // Network license.
 	{
 		// Try to find a RAP file to get the key.
-		if (!GetKeyFromRap(npd->content_id, npdrm_key))
+		if (!GetKeyFromRap(npd->get_content_id(), npdrm_key))
 		{
 			self_log.error("Can't decrypt network NPDRM!");
 			return false;
@@ -1074,7 +1074,7 @@ bool SELFDecrypter::DecryptNPDRM(u8 *metadata, u32 metadata_size)
 	else if (npd->license == 2)  // Local license.
 	{
 		// Try to find a RAP file to get the key.
-		if (!GetKeyFromRap(npd->content_id, npdrm_key))
+		if (!GetKeyFromRap(npd->get_content_id(), npdrm_key))
 		{
 			self_log.error("Can't find RAP file for NPDRM decryption!");
 			return false;
@@ -1283,14 +1283,13 @@ fs::file SELFDecrypter::MakeElf(bool isElf32)
 	return e;
 }
 
-bool SELFDecrypter::GetKeyFromRap(const char* content_id, u8* npdrm_key)
+bool SELFDecrypter::GetKeyFromRap(std::string_view content_id, u8* npdrm_key)
 {
 	// Set empty RAP key.
 	std::array<u8, 0x10> rap_key {};
 
 	// Try to find a matching RAP file under exdata folder.
-	const std::string ci_str = content_id;
-	const std::string rap_path = rpcs3::utils::get_rap_file_path(ci_str);
+	const std::string rap_path = rpcs3::utils::get_rap_file_path(content_id);
 
 	// Open the RAP file and read the key.
 	const fs::file rap_file(rap_path);
@@ -1303,7 +1302,7 @@ bool SELFDecrypter::GetKeyFromRap(const char* content_id, u8* npdrm_key)
 		return false;
 	}
 
-	self_log.notice("Loading RAP file %s.rap", ci_str);
+	self_log.notice("Loading RAP file %s.rap", content_id);
 
 	if (rap_file.read(rap_key.data(), rap_key.size()) != rap_key.size())
 	{
diff --git a/rpcs3/Crypto/unself.h b/rpcs3/Crypto/unself.h
index 22eafb074b..beae02500b 100644
--- a/rpcs3/Crypto/unself.h
+++ b/rpcs3/Crypto/unself.h
@@ -478,7 +478,7 @@ public:
 	bool DecryptData();
 	bool DecryptNPDRM(u8 *metadata, u32 metadata_size);
 	const NPD_HEADER* GetNPDHeader() const;
-	static bool GetKeyFromRap(const char *content_id, u8 *npdrm_key);
+	static bool GetKeyFromRap(std::string_view content_id, u8 *npdrm_key);
 
 private:
 	template<typename EHdr, typename SHdr, typename PHdr>
diff --git a/rpcs3/Emu/Cell/Modules/cellGame.cpp b/rpcs3/Emu/Cell/Modules/cellGame.cpp
index d7073a4e47..d9336fe16c 100644
--- a/rpcs3/Emu/Cell/Modules/cellGame.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellGame.cpp
@@ -1313,7 +1313,7 @@ error_code cellGameDeleteGameData(vm::cptr<char> dirName)
 {
 	cellGame.warning("cellGameDeleteGameData(dirName=%s)", dirName);
 
-	if (!dirName)
+	if (!dirName || sysutil_check_name_string(dirName.get_ptr(), 1, CELL_GAME_DIRNAME_SIZE) != 0)
 	{
 		return CELL_GAME_ERROR_PARAM;
 	}
diff --git a/rpcs3/Emu/Cell/Modules/cellMusicSelectionContext.cpp b/rpcs3/Emu/Cell/Modules/cellMusicSelectionContext.cpp
index 6ce57e294f..1030dbc592 100644
--- a/rpcs3/Emu/Cell/Modules/cellMusicSelectionContext.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellMusicSelectionContext.cpp
@@ -17,7 +17,22 @@ bool music_selection_context::set(const CellMusicSelectionContext& in)
 	}
 
 	constexpr u32 pos = sizeof(magic);
-	hash = &in.data[pos];
+
+	const std::string_view data{&in.data[pos], sizeof(in.data) - pos};
+	const std::string_view new_hash = data.substr(0, data.find_first_of('\0'));
+
+	const bool is_valid_hash = !new_hash.empty() && std::all_of(new_hash.begin(), new_hash.end(), [](char c)
+	{
+		return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '-' || c == '_';
+	});
+
+	if (!is_valid_hash)
+	{
+		cellMusicSelectionContext.error("Invalid music selection context hash, context = %s", context_to_hex(in));
+		return false;
+	}
+
+	hash = std::string{new_hash};
 
 	return load_playlist();
 }
@@ -35,7 +50,7 @@ CellMusicSelectionContext music_selection_context::get() const
 	std::memset(out.data, 0, CELL_MUSIC_SELECTION_CONTEXT_SIZE);
 	std::memcpy(out.data, magic, sizeof(magic));
 	pos += sizeof(magic);
-	std::memcpy(&out.data[pos], hash.c_str(), hash.size());
+	std::memcpy(&out.data[pos], hash.data(), hash.size());
 
 	return out;
 }
diff --git a/rpcs3/Emu/Cell/Modules/cellRec.cpp b/rpcs3/Emu/Cell/Modules/cellRec.cpp
index 511cc7c852..cef43e4f7b 100644
--- a/rpcs3/Emu/Cell/Modules/cellRec.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellRec.cpp
@@ -1333,13 +1333,13 @@ error_code cellRecClose(s32 isDiscard)
 				rec.sink->stop(true);
 			}
 
-			if (fs::is_file(rec.param.filename))
+			if (const std::string local_path = vfs::get(rec.param.filename); fs::is_file(local_path))
 			{
 				cellRec.warning("cellRecClose: removing discarded recording '%s'", rec.param.filename);
 
-				if (!fs::remove_file(rec.param.filename))
+				if (!fs::remove_file(local_path))
 				{
-					cellRec.error("cellRecClose: failed to remove recording '%s'", rec.param.filename);
+					cellRec.error("cellRecClose: failed to remove recording '%s' (%s)", rec.param.filename, fs::g_tls_error);
 				}
 			}
 		}
diff --git a/rpcs3/Emu/Cell/Modules/cellSaveData.cpp b/rpcs3/Emu/Cell/Modules/cellSaveData.cpp
index 22086bdf5c..5f6fd0eb76 100644
--- a/rpcs3/Emu/Cell/Modules/cellSaveData.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellSaveData.cpp
@@ -214,6 +214,16 @@ int check_filename(std::string_view file_path, bool disallow_system_files, bool
 	return 0;
 }
 
+static bool is_valid_dir_name(const std::string& dir_name)
+{
+	if (dir_name.empty() || dir_name.find_first_of('\0') != umax)
+	{
+		return false;
+	}
+
+	return sysutil_check_name_string(dir_name.c_str(), 1, CELL_SAVEDATA_DIRNAME_SIZE) == 0;
+}
+
 static std::vector<SaveDataEntry> get_save_entries(const std::string& base_dir, const std::string& prefix)
 {
 	std::vector<SaveDataEntry> save_entries;
@@ -251,6 +261,12 @@ static std::vector<SaveDataEntry> get_save_entries(const std::string& base_dir,
 		save_entry.subtitle  = psf::get_string(psf, "SUB_TITLE");
 		save_entry.details   = psf::get_string(psf, "DETAIL");
 
+		if (!is_valid_dir_name(save_entry.dirName))
+		{
+			cellSaveData.error("Savedata '%s' has an invalid SAVEDATA_DIRECTORY entry ('%s')", entry.name, save_entry.dirName);
+			continue;
+		}
+
 		for (const auto& entry2 : fs::dir(base_dir + entry.name))
 		{
 			if (entry2.is_directory || check_filename(vfs::unescape(entry2.name), false, true))
@@ -848,6 +864,12 @@ static NEVER_INLINE error_code savedata_op(ppu_thread& ppu, u32 operation, u32 v
 						save_entry2.subtitle  = psf::get_string(psf, "SUB_TITLE");
 						save_entry2.details   = psf::get_string(psf, "DETAIL");
 
+						if (!is_valid_dir_name(save_entry2.dirName))
+						{
+							cellSaveData.error("Savedata '%s' has an invalid SAVEDATA_DIRECTORY entry ('%s')", entry.name, save_entry2.dirName);
+							break;
+						}
+
 						for (const auto& entry2 : fs::dir(base_dir + entry.name))
 						{
 							if (entry2.is_directory || check_filename(vfs::unescape(entry2.name), false, true))
@@ -1468,6 +1490,12 @@ static NEVER_INLINE error_code savedata_op(ppu_thread& ppu, u32 operation, u32 v
 		save_entry.escaped = vfs::escape(save_entry.dirName);
 	}
 
+	if (!is_valid_dir_name(save_entry.dirName))
+	{
+		cellSaveData.error("savedata_op(): invalid savedata directory name ('%s')", save_entry.dirName);
+		return {CELL_SAVEDATA_ERROR_BROKEN, save_entry.dirName};
+	}
+
 	const std::string dir_path = base_dir + save_entry.escaped + "/";
 	const std::string old_path = base_dir + ".backup_" + save_entry.escaped + "/";
 	const std::string new_path = base_dir + ".working_" + save_entry.escaped + "/";
@@ -2215,7 +2243,7 @@ static NEVER_INLINE error_code savedata_get_list_item(vm::cptr<char> dirName, vm
 		return {CELL_SAVEDATA_ERROR_PARAM, "107"};
 	}
 
-	switch (sysutil_check_name_string(dirName.get_ptr(), 1, CELL_SAVEDATA_DIRLIST_MAX))
+	switch (sysutil_check_name_string(dirName.get_ptr(), 1, CELL_SAVEDATA_DIRNAME_SIZE))
 	{
 	case -1:
 	{
diff --git a/rpcs3/Emu/Cell/Modules/sceNp.cpp b/rpcs3/Emu/Cell/Modules/sceNp.cpp
index 1e09b8f493..8fe1f7d5f6 100644
--- a/rpcs3/Emu/Cell/Modules/sceNp.cpp
+++ b/rpcs3/Emu/Cell/Modules/sceNp.cpp
@@ -699,7 +699,7 @@ error_code npDrmIsAvailable(vm::cptr<u8> k_licensee_addr, vm::cptr<char> drm_pat
 			}
 			else
 			{
-				const std::string rap_file = rpcs3::utils::get_rap_file_path(npd.content_id);
+				const std::string rap_file = rpcs3::utils::get_rap_file_path(npd.get_content_id());
 
 				if (fs::file rap_fd{rap_file})
 				{
diff --git a/rpcs3/Emu/Cell/lv2/sys_fs.cpp b/rpcs3/Emu/Cell/lv2/sys_fs.cpp
index 931e0c22d9..909cf17cc0 100644
--- a/rpcs3/Emu/Cell/lv2/sys_fs.cpp
+++ b/rpcs3/Emu/Cell/lv2/sys_fs.cpp
@@ -460,7 +460,7 @@ lv2_fs_mount_point* lv2_fs_object::get_mp(std::string_view filename, std::string
 		filename.remove_prefix(cell_fs_path.size());
 
 	const bool is_path = filename.starts_with("/"sv);
-	std::string mp_name = is_path ? std::string{get_path_root_and_trail(filename).first} : std::string(filename);
+	std::string mp_name = is_path ? "/" + std::string{get_path_root_and_trail(filename).first} : std::string(filename);
 
 	const auto check_mp = [&]()
 	{
@@ -521,9 +521,6 @@ lv2_fs_mount_point* lv2_fs_object::get_mp(std::string_view filename, std::string
 			*vfs_path = g_cfg_vfs.get_dev_flash3();
 		else
 			*vfs_path = {};
-
-		if (is_path && !is_cell_fs_path && !vfs_path->empty())
-			vfs_path->append(filename.substr(mp_name.size()));
 	}
 
 	return result;
diff --git a/rpcs3/Emu/Cell/lv2/sys_fs.h b/rpcs3/Emu/Cell/lv2/sys_fs.h
index f3ccfeee67..df34a0c5fa 100644
--- a/rpcs3/Emu/Cell/lv2/sys_fs.h
+++ b/rpcs3/Emu/Cell/lv2/sys_fs.h
@@ -246,8 +246,8 @@ public:
 
 	lv2_fs_object& operator=(const lv2_fs_object&) = delete;
 
-	// Get the device's root path (e.g. "/dev_hdd0") from a given path
-	// Cut the trail and return it in seccond argument
+	// Get the device's root path (e.g. "dev_hdd0") from a given path
+	// Cut the trail and return it in second argument
 	static std::pair<std::string_view, std::string> get_path_root_and_trail(std::string_view path);
 
 	// Get the device's root path (e.g. "/dev_hdd0") from a given path
diff --git a/rpcs3/Emu/system_utils.cpp b/rpcs3/Emu/system_utils.cpp
index f95d65fd69..9e39827b30 100644
--- a/rpcs3/Emu/system_utils.cpp
+++ b/rpcs3/Emu/system_utils.cpp
@@ -378,8 +378,27 @@ namespace rpcs3::utils
 		return file_list;
 	}
 
+	static bool is_valid_content_id(std::string_view content_id)
+	{
+		if (content_id.empty() || content_id.size() > 0x30)
+		{
+			return false;
+		}
+
+		return std::all_of(content_id.begin(), content_id.end(), [](char c)
+		{
+			return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '-' || c == '_';
+		});
+	}
+
 	std::string get_rap_file_path(const std::string_view& rap)
 	{
+		if (!is_valid_content_id(rap))
+		{
+			sys_log.error("get_rap_file_path(): invalid content id '%s'", rap);
+			return {};
+		}
+
 		const std::string home_dir = get_hdd0_dir() + "home";
 
 		std::string rap_path;
@@ -402,6 +421,12 @@ namespace rpcs3::utils
 
 	std::string get_c00_unlock_edat_path(const std::string_view& content_id)
 	{
+		if (!is_valid_content_id(content_id))
+		{
+			sys_log.error("get_c00_unlock_edat_path(): invalid content id '%s'", content_id);
+			return {};
+		}
+
 		const std::string home_dir = get_hdd0_dir() + "home";
 
 		std::string edat_path;
@@ -448,7 +473,7 @@ namespace rpcs3::utils
 			return false;
 		}
 
-		std::string edat_content_id = npd.content_id;
+		std::string edat_content_id{npd.get_content_id()};
 
 		if (edat_content_id != content_id)
 		{
diff --git a/rpcs3/Loader/TRP.cpp b/rpcs3/Loader/TRP.cpp
index 452b7c9384..541b4d95f7 100644
--- a/rpcs3/Loader/TRP.cpp
+++ b/rpcs3/Loader/TRP.cpp
@@ -1,11 +1,18 @@
 #include "stdafx.h"
 #include "Emu/VFS.h"
+#include "Emu/System.h"
 #include "TRP.h"
 #include "Crypto/sha1.h"
 #include "Utilities/StrUtil.h"
 
 LOG_CHANNEL(trp_log, "Trophy");
 
+static std::string get_entry_name(const TRPEntry& entry)
+{
+	const std::string_view name{entry.name, sizeof(entry.name)};
+	return std::string{name.substr(0, name.find_first_of('\0'))};
+}
+
 TRPLoader::TRPLoader(const fs::file& f)
 	: m_file(f)
 {
@@ -51,7 +58,16 @@ bool TRPLoader::Install(std::string_view dest, bool /*show*/)
 		}
 
 		// Create the file in the temporary directory
-		const std::string filename = temp + '/' + vfs::escape(entry.name);
+		const std::string entry_name = get_entry_name(entry);
+		const std::string filename = temp + '/' + vfs::escape(entry_name, true);
+
+		if (!Emu.IsPathInsideDir(filename, temp, false))
+		{
+			trp_log.error("Error extracting %s from TRP: target path '%s' would be extracted outside of '%s'", entry_name, filename, temp);
+			success = false;
+			break;
+		}
+
 		success = fs::write_file<true>(filename, fs::create + fs::excl, buffer);
 		if (!success)
 		{
@@ -160,7 +176,7 @@ bool TRPLoader::LoadHeader(bool show)
 	{
 		for (const auto& entry : m_entries)
 		{
-			trp_log.notice("TRP entry #%u: %s", &entry - m_entries.data(), entry.name);
+			trp_log.notice("TRP entry #%u: %s", &entry - m_entries.data(), get_entry_name(entry));
 		}
 	}
 
@@ -184,7 +200,7 @@ bool TRPLoader::ContainsEntry(std::string_view filename)
 
 	for (const TRPEntry& entry : m_entries)
 	{
-		if (entry.name == filename)
+		if (get_entry_name(entry) == filename)
 		{
 			return true;
 		}
@@ -202,7 +218,7 @@ void TRPLoader::RemoveEntry(std::string_view filename)
 	std::vector<TRPEntry>::iterator i = m_entries.begin();
 	while (i != m_entries.end())
 	{
-		if (i->name == filename)
+		if (get_entry_name(*i) == filename)
 		{
 			i = m_entries.erase(i);
 		}
@@ -222,7 +238,7 @@ void TRPLoader::RenameEntry(std::string_view oldname, std::string_view newname)
 
 	for (TRPEntry& entry : m_entries)
 	{
-		if (entry.name == oldname)
+		if (get_entry_name(entry) == oldname)
 		{
 			strcpy_trunc(entry.name, newname);
 		}