UE4SS

Spec sheet

Purpose

UE4SS is a Lua scripting system, C++ modding API, SDK generator, Blueprint mod loader, live property editor, and set of dumping utilities for UE4/5 games.Read 9 Oct 2026 · docs.ue4ss.com

Intended users

The basic install is intended for end users using UE4SS-dependent mods, while the developer install is intended for mod developers or users who need debugging, dumping, or other utilities.Read 4 Oct 2026 · docs.ue4ss.com

Blueprint mods

Blueprint mods can be spawned automatically without editing or replacing game files.Read 9 Oct 2026 · docs.ue4ss.com

C++ mods

UE4SS provides an API for writing C++ mods based on the Unreal Engine object system.Read 9 Oct 2026 · docs.ue4ss.com

Code generation

UE4SS can generate Unreal Header Tool compatible headers for a mirror project and standard C++ headers from reflected classes and blueprints.Read 4 Oct 2026 · docs.ue4ss.com

Community support

The documentation links to UE4SS and Unreal Engine modding Discord servers for community access.Read 9 Oct 2026 · docs.ue4ss.com

Compatibility limit

UE4SS is not intended to work plug-and-play with every game, and some games may require users to update AOBs themselves.Read 9 Oct 2026 · docs.ue4ss.com

Compatibility limitation

UE4SS is not described as a plug-and-play solution that works with every game; users may need to update AOBs themselves.Read 4 Oct 2026 · docs.ue4ss.com

Config caveat

Custom game configuration files may become outdated as games or UE4SS are updated, and the documentation directs users to report stale configs through the project repository.Read 9 Oct 2026 · docs.ue4ss.com

Development requirements

Building requires an MSVC version that supports C++23, Rust 1.73.0 or later, CMake 3.22 or later, and Ninja or MSVC as the build system.Read 9 Oct 2026 · docs.ue4ss.com

Dumping tools

UE4SS can generate Unreal Header Tool compatible headers, standard C++ headers with offsets, .usmap mapping files, and .umap files from loaded actors.Read 9 Oct 2026 · docs.ue4ss.com

File and map utilities

Its dumpers can generate .usmap mapping files for unversioned properties and dump loaded actors to generate .umaps in-editor.Read 4 Oct 2026 · docs.ue4ss.com

Installation

The basic installation uses a non-dev, non-experimental release extracted into the game's Binaries/Win64 directory; mod developers can use the zDEV version.Read 9 Oct 2026 · docs.ue4ss.com

Installation options

The installation guide describes basic and developer packages, experimental builds, manual injection, and a central install location for multiple games.Read 4 Oct 2026 · docs.ue4ss.com

Linux note

The documentation says Linux support might happen eventually but not soon; it separately describes cross-compiling Windows binaries from Linux.Read 9 Oct 2026 · docs.ue4ss.com

Live property editor

The live property viewer and editor can search, view, edit, and watch properties of loaded objects for mod debugging and runtime inspection.Read 9 Oct 2026 · docs.ue4ss.com

Lua API status

The Lua API page identifies itself as version 3.0.0 documentation and says its status is incomplete and its full overview may be out of date.Read 9 Oct 2026 · docs.ue4ss.com

Lua mods

Its Lua API lets users write mods based on the Unreal Engine object system.Read 9 Oct 2026 · docs.ue4ss.com

Platform

The build documentation lists Win64 as its supported platform and says Linux support might happen later, but not soon.Read 4 Oct 2026 · docs.ue4ss.com

Security reporting

The project asks users to report sensitive security issues by emailing [email protected] rather than posting them to the issue tracker.Read 4 Oct 2026 · docs.ue4ss.com

Support channels

The documentation directs users to search existing issues and documentation first, then open an issue with context, platform versions, and logs when available.Read 4 Oct 2026 · docs.ue4ss.com

Target versions

The documentation describes targeting Unreal Engine versions 4.7 through 5.8.Read 9 Oct 2026 · docs.ue4ss.com

UE support

The documentation lists target Unreal Engine versions from 4.7 to 5.8.Read 4 Oct 2026 · docs.ue4ss.com

Windows support

The documented build platform is 64-bit Windows, and the build requirements call for a Windows computer.Read 9 Oct 2026 · docs.ue4ss.com

Where Specifiction places it

• Game Mod Loaders#23 of 267.0