CVE-2026-45289

CloudburstMC Protocol: Partially missing validation for FULL type authentication tokens

State: Published
Severity: 5.3 Medium
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: May 11, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
ProtocolCloudburstMC	< 3.0.0.Beta12-20260420.182526-15Affected

References

https://github.com/CloudburstMC/Protocol/security/advisories/GHSA-g2fr-c75x-4hf9

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