CVE-2026-45289Network attack vector

Unauthenticated token acceptance via missing identity claims

Published Jun 2, 2026 · Updated Jun 2, 2026

Improper authentication in CloudburstMC Protocol before 3.0.0.Beta12-20260420.182526-15 allows remote attackers to submit incomplete FULL tokens. EncryptionUtils validation returned FULL-token results without requiring the xid and xname identity fields. The path is exposed only through network-facing software that embeds the library; no existing privileges or user interaction are required, and no data disclosure or service interruption is reported.

CVSS severity5.3
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in CloudburstMC Protocol before 3.0.0.Beta12-20260420.182526-15 allows remote attackers to submit incomplete FULL tokens. EncryptionUtils validation returned FULL-token results without requiring the xid and xname identity fields. The path is exposed only through network-facing software that embeds the library; no existing privileges or user interaction are required, and no data disclosure or service interruption is reported.

The record

CVE
CVE-2026-45289
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
CloudburstMC
Product
Protocol
Classifications
CWE-287
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.0.0.Beta12-20260420.182526-15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CloudburstMC · Protocolversion=< 3.0.0.Beta12-20260420.182526-15

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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