One Password Auth
by bearcott
One Password Auth gates an offline Fabric or Paper server behind a single shared password that every player enters at login.
What it does
Players who join a server running the mod are frozen, made invincible and blinded, then placed in spectator mode until they enter the password. The shared password is set on first boot in a generated config file, which also holds optional settings such as the login title, the login description and the kick message. Once a player has logged in, the server remembers their IP and the next login is handled by a dialogue instead of a prompt. Changing any setting means editing the config file and restarting the server.
The mod is aimed at small friend groups and private communities that want access control without per-user accounts or complex authentication schemes. It protects player data and inventories before authentication, including when an operator account is connected, and it blocks block-breaking packets sent by hacked clients. Players who are moved or teleported away from their locked position are returned by a per-tick check. Fabric API is required on the Fabric build, and nothing else is needed.
Key features
Single shared password
One password, set in the config file, grants access to the whole server, and changing it kicks everyone off.
Login lock
Players stay frozen, invincible and in spectator mode until they authenticate, and locked positions are enforced every tick.
Customizable login screen
The login title and description accept color and format codes, and the text can be restyled in the config file.
Exploit protection
Data and inventories are protected before login, and block-breaking packets from hacked clients are disabled.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: The mod suits server owners who run small offline Fabric or Paper servers for a known group of players and want shared-password access.
How it compares
AutoLogin is a Fabric client-side only mod, licensed under the MIT License and open source, for 1.21 – 26.3, so it adds nothing on the server. ServerPassword is server-side only, open source under the MIT License and published for 26.2 – 26.3. Server List Password Mod runs on client and server, is not open source, and covers 1.21.1 – 1.21.11. One Password Auth is a server mod that is not open source, with its own shared-password flow.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| One Password Auth | Fabric | 1.21.1 – 26.2 | Not published | 2026-09-20 |
| AutoLogin | Fabric | 1.21 – 26.3 | Client-side only | 2026-09-27 |
| ServerPassword | Fabric | 26.2 – 26.3 | Server-side only | 2026-09-29 |
| Server List Password Mod | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-07-16 |
Questions
Does One Password Auth need Fabric API?
Do players need the mod installed?
Can the password be changed after setup?
In the catalog
One Password Auth is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 13,894 mods support Minecraft 26.2.
Similar mods
What the author says
A lightweight server-side mod/plugin that protects your offline (or online) server with a single shared password. Designed for small friend groups and private communities—no per-user accounts, no complex authentication schemes, just one password everyone shares! Fabric: drop one-password-auth-fabric-*.jar into mods/…
Official listing
- Modrinth page
- modrinth.com/mod/one-password-auth
- Owner
- bearcott
- Published
- 2026-03-10
- Updated on Modrinth
- 2026-09-20
- Facts verified
- 2026-10-15