Modrinth · Minecraft mod

InvalidPlayerBypassList

InvalidPlayerBypassList allows specific players - added to a configurable bypass list - to join a server even when online-mode is set to true, without passing Mojang authentication.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which InvalidPlayerBypassList release matches 26.1.2?

Updated 6 months ago

Best match for your filters 1.1.1_26.1-26.1.2

Game version 26.1, 26.1.1, 26.1.2

Loader Fabric

InvalidPlayerBypassList 1.1.1_26.1-26.1.2 targets 26.1, 26.1.1, 26.1.2 with Fabric. Do not install it on the client. It must be installed on the dedicated server. No extra mods listed for this file.

Where it goes

Is InvalidPlayerBypassList required on the client, server, or both?

Do not install it on the client. It must be installed on the dedicated server.

Client Not supported

Dedicated server Required

Loader for this release Fabric

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

This file is marked server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does InvalidPlayerBypassList 1.1.1_26.1-26.1.2 need?

1.1.1_26.1-26.1.2 on 26.1.2. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add InvalidPlayerBypassList without breaking your instance.

Built for InvalidPlayerBypassList 1.1.1_26.1-26.1.2 on 26.1.2. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use 1.1.1_26.1-26.1.2. It targets 26.1, 26.1.1, 26.1.2 with Fabric; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

This file does not list any required mods. Do not add a library just because a different file uses it.
03
Put it on the correct side

Do not install it on the client. It must be installed on the dedicated server.
04
Pick the file you checked

Use the “Get this file” button beside 1.1.1_26.1-26.1.2. It opens that exact file at the source.

About this project

What does InvalidPlayerBypassList add?

Goal

InvalidPlayerBypassList allows specific players to join a Minecraft server even when the server is in online mode, regardless of Mojang authentication.
This is particularly useful for private testing, LAN setups, or fallback scenarios where certain usernames (and optionally IPs) should be allowed to bypass authentication checks.

This mod works only if the server is in online-mode=true, and it will intercept login attempts and allow access if the player's name and IP match entries in a configurable bypass list.

How It Works

When a player tries to join the server, the mod checks if they are present in the bypass list. This list is defined by pairs of:

Username
Optional IP address

If IP enforcement is enabled via config, the player must match both the name and IP. Otherwise, just the name is sufficient if "none" is specified.

Commands

You can manage the bypass list directly using Minecraft server commands:

`/bypasslist add <player> [ip]`

Adds a player (with optional IP) to the bypass list.
If IP checking is enabled, the IP must be provided.

`/bypasslist remove <player> [ip]`

Removes a specific player from the bypass list.
If the IP is not provided, all entries for the player will be removed.

`/bypasslist list`

Lists all current entries in the bypass list with their associated IPs.

`/bypasslist on`

Enables the bypass list at runtime.

`/bypasslist off`

Disables the bypass list at runtime.

All commands require a permission level of 2 or higher (e.g., server operators).

Config

Configuration can be found under invalidplayerbypasslist.properties and includes the following settings:

Property	Description	Type	Default
`ip-required`	If true, players must match both username and IP to bypass authentication.	boolean	true
`enforce-bypasslist`	If true, the bypass list is active on server startup.	boolean	true

Use Cases

This mod is ideal for:

Whitelisted development environments
Testing servers with known usernames/IPs
Offline access fallback while still in online-mode
Controlled security bypass for known players

Reporting Issues

If you find a bug or want to request a feature:

Go to the Issues tab of the repository.
Click New Issue.
Use the appropriate template (Bug Report or Feature Request).
Fill in all relevant details.
Submit the issue.