CVE-2023-45859Network attack vector

Authenticated cluster-data access via missing permission checks

Published Feb 28, 2024 · Updated Nov 29, 2024

Authorization bypass in Hazelcast 5.3.0 through 5.3.4 and earlier affected branches allows remote authenticated users to access cluster data. Client-protocol operation handlers perform requested data actions without enforcing the permissions configured for the authenticated principal. Exploitation requires a valid client identity and network access to the cluster; the flaw bypasses per-operation authorization rather than authentication.

CVSS severity7.6
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Hazelcast 5.3.0 through 5.3.4 and earlier affected branches allows remote authenticated users to access cluster data. Client-protocol operation handlers perform requested data actions without enforcing the permissions configured for the authenticated principal. Exploitation requires a valid client identity and network access to the cluster; the flaw bypasses per-operation authorization rather than authentication.

The record

CVE
CVE-2023-45859
Published
Feb 28, 2024
Updated
Nov 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-922, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 29, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.6GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-922Insecure Storage of Sensitive Information
T1213Data from Information Repositories

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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