CVE-2026-45289
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
The CloudburstMC Protocol library prior to version 3.0.0.Beta12-20260420.182526-15 partially misses validation for FULL type authentication tokens, affecting EncryptionUtils methods for validating auth payloads.
Risk Assessment
Publicly accessible software using this library may be vulnerable to authentication bypass attacks, leading to unauthorized access.
Recommendation
Update the CloudburstMC Protocol library to version 3.0.0.Beta12-20260420.182526-15 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

