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VulnerabilityPublished

CVE-2026-45289: CloudburstMC Protocol · Improper Authentication

Affects CloudburstMC ProtocolSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 3.0.0.Beta12-20260420.182526-15 when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.0.0.Beta12-20260420.182526-15
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade CloudburstMC Protocol to 3.0.0.Beta12-20260420.182526-15.

Affected software

ProductAffectedFixed in
CloudburstMCProtocolAffected
  • <3.0.0.Beta12-20260420.182526-15
Fixed in
  • 3.0.0.Beta12-20260420.182526-15

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to CloudburstMC Protocol version 3.0.0.Beta12-20260420.182526-15 or later, where the authentication validation issue has been patched. No other mitigations or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is included in that version.

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.

References

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