CVE-2023-45859: Hazelcast

High severity, CVSS 7.6. EPSS: 0.5% chance of exploitation in the next 30 days.

In Hazelcast through 4.1.10, 4.2 through 4.2.8, 5.0 through 5.0.5, 5.1 through 5.1.7, 5.2 through 5.2.4, and 5.3 through 5.3.2, some client operations don't check permissions properly, allowing authenticated users to access data stored in the cluster.

Affected products

• Hazelcast Hazelcast: up to and including 4.1.10; from 4.2.0, up to and including 4.2.8; from 5.0.0, up to and including 5.0.5; from 5.1.0, up to and including 5.1.7; from 5.2.0, before 5.2.5 (fixed in 5.2.5); from 5.3.0, before 5.3.5 (fixed in 5.3.5)

Published 2024-02-28. Last modified 2026-06-17.