Impersonation of other users (passing XBOX Live authentication) by theft of logins in PocketMine-MP

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Impact Minecraft Bedrock authentication and its protocol encryption are inseparably linked. One is not complete without the other. This vulnerability affects servers which are able to be directly connected to via the internet (i.e. not behind a proxy). If you are using a proxy, please check that it supports protocol encryption and that it is enabled. Technical details <details <summaryclick to expand</summary Basics 1. The client generates a private ECC key clientPriv which it uses to complete ECDH for encryption. 2. A JWT containing the public key clientPub corresponding to this key is signed by Microsoft servers with the Mojang root public key mojangPub. 3. The server verifies that the token was issued by Microsoft servers by verifying the JWT signature with mojangPub. Why this is a problem However, this only ensures that the token was issued by Microsoft. It does not ensure that the client actually possesses the private key corresponding to the public key in the token. In a login…

Published by the source

21 Jan 2022, 23:02 UTC

Last modified by the source

11 Jan 2023, 05:04 UTC

Source last checked

26 Oct 2026, 13:56 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-h79x-98r2-g6qc

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# Patch Next advisory brief: GHSA-h79x-98r2-g6qc

Advisory: Impersonation of other users (passing XBOX Live authentication) by theft of logins in PocketMine-MP
IDs: GHSA-h79x-98r2-g6qc
Record: https://patchnext.com/advisories/ghsa-h79x-98r2-g6qc (revision 1, source checked 26 Oct 2026, 13:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pocketmine/pocketmine-mp 4.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist pocketmine/pocketmine-mp: affected >= 3.0.0, < 4.0.0; fixed in 4.0.0

## Suggested inspection (read-only)
- Packagist pocketmine/pocketmine-mp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pocketmine/pocketmine-mp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-h79x-98r2-g6qc (GitHub-reviewed advisory GHSA-h79x-98r2-g6qc lists affected ranges: Packagist pocketmine/pocketmine-mp >=3.0.0 <4.0.0)

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