PT-2026-45856 · Cloudburstmc · Protocol

Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-45289

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CloudburstMC Protocol is a protocol library for Minecraft Bedrock Edition. Prior to version 3.0.0.Beta12-20260420.182526-15, CloudburstMC Protocol is partially missing validation for FULL type authentication tokens (Cloudburst/Protocol). This vulnerability impacts publicly accessible software depending on the affected versions of Protocol, specifically the EncryptionUtils methods to validate auth payloads for FULL type tokens. This issue has been patched in version 3.0.0.Beta12-20260420.182526-15.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-45289

Affected Products

Protocol

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-45289 · Security Note
• https://github.com/CloudburstMC/Protocol/security/advisories/GHSA-g2fr-c75x-4hf9 · Note