CVE-2026-45289
Authentication Token Validation Flaw in CloudburstMC Protocol
Publication date: 2026-06-02
Last updated on: 2026-06-02
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cloudburstmc | protocol | to 3.0.0.Beta12-20260420.182526-15 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The vulnerability exists in the CloudburstMC Protocol library used for Minecraft Bedrock Edition. Before version 3.0.0.Beta12-20260420.182526-15, the protocol partially lacks proper validation for FULL type authentication tokens. Specifically, the EncryptionUtils methods that validate authentication payloads for these FULL type tokens do not fully validate them, which can lead to security issues.
How can this vulnerability impact me? :
This vulnerability can impact publicly accessible software that depends on the affected versions of the CloudburstMC Protocol. Because the validation of FULL type authentication tokens is incomplete, an attacker might exploit this to bypass certain authentication checks, potentially leading to unauthorized actions or access within the affected software.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should update the CloudburstMC Protocol library to version 3.0.0.Beta12-20260420.182526-15 or later, where the issue has been patched.