Serverauth Mod
by kingewes
Serverauth Mod adds a login system to a Fabric server, letting administrators control which accounts can join and how players sign in.
What it does
Serverauth is a server-side login module for Fabric. Administrators have full control over accounts, and players cannot register themselves, so the server decides who has access. A forced login requirement can be turned on, and players must then authenticate before they can play.
Once logged in, players can bind their account to a device through its UUID. A device-bound auto-login then lets them skip the password on later visits, for a period the server sets in days, with 0 meaning permanent validity. Accounts bound for longer than that period require a manual password entry again. Login location restoration returns each player to the spawn point after a successful login.
Administrator commands all begin with auth. Idle timeouts force a logout after a set number of minutes without activity, and 0 disables the timeout. Login attempts are limited to a configured maximum, and a failed login can kick the player. The mod is released under the MIT License and is not open source. The latest file is 1.5.0 for 26.1.2.
Key features
Administrator-only registration
Players cannot create accounts themselves, so administrators add every account that can join the server.
Device-bound auto-login
A player can bind an account to a device's UUID so later visits sign in automatically, while the validity period can be set in days.
Idle timeout
Inactive players are logged out after a configured number of minutes and must log in again to continue.
Login location restoration
Each player is returned to the spawn point they started from once the login is accepted.
Attempt limits
A maximum number of login attempts can be set, and failing players can be kicked from the server.
Gallery
Compatibility
Latest build for each game version and loader.
26.x3 of 3 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who run Fabric servers and want administrator control over player accounts, login periods and idle timeouts.
How it compares
Potato Auth is a Fabric mod that runs on the client only, under the MIT License, with files for 1.20 – 1.21.5, so it is not a server-side login module. Lyumix Discord Auth is server-side only and open source under the MIT License, but published for 1.21 – 1.21.1 on Fabric alone. Serverauth Mod itself runs on the server and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Serverauth Mod | Fabric | 1.20 – 26.1.2 | Server-side only | 2026-07-20 |
| Potato Auth | Fabric | 1.20 – 1.21.5 | Client-side only | 2025-11-27 |
| Lyumix Discord Auth | Fabric | 1.21 – 1.21.1 | Server-side only | 2025-02-10 |
Questions
Does Serverauth Mod need to be installed on player clients?
Which Minecraft versions does Serverauth Mod support?
How does the auto-login validity period work?
In the catalog
Serverauth Mod is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 15,189 mods support Minecraft 26.1.2.
Similar mods
What the author says
· Mandatory Login Verification: Unauthenticated players cannot move or interact (teleported to void space with black screen hover). · Device-Bound Auto-Login: Players may opt to bind their account to their device's UUID for automatic
Official listing
- Modrinth page
- modrinth.com/mod/serverauth-mod
- Owner
- kingewes
- Published
- 2026-03-02
- Updated on Modrinth
- 2026-07-20
- Facts verified
- 2026-10-15