What’s Vulnerable › Vulnerabilities

CVE-2020-26168

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-11-09 · updated 2026-06-17
• Weakness: CWE-287

Description

The LDAP authentication method in LdapLoginModule in Hazelcast IMDG Enterprise 4.x before 4.0.3, and Jet Enterprise 4.x through 4.2, doesn't verify properly the password in some system-user-dn scenarios. As a result, users (clients/members) can be authenticated even if they provide invalid passwords.

Affected products

• hazelcast: from 4.0 before 4.0.3 — fixed in 4.0.3
• hazelcast Jet: from 4.0 through 4.2

How to fix

Upgrade to a fixed version: hazelcast 4.0.3. Check the vendor advisory for mitigations.

References

• https://docs.hazelcast.org/docs/ern/index.html#4-0-3
• https://hazelcast.zendesk.com/hc/en-us/articles/360050161951--IMDG-Enterprise-4-0-4-0-1-4-0-2-LDAP-Authentication-Bypass
• https://hazelcast.zendesk.com/hc/en-us/articles/360051384932--JET-Enterprise-4-0-4-1-4-1-1-4-2-LDAP-Authentication-Bypass
• https://jet-start.sh/blog/2020/10/23/jet-43-is-released
• https://docs.hazelcast.org/docs/ern/index.html#4-0-3
• https://hazelcast.zendesk.com/hc/en-us/articles/360050161951--IMDG-Enterprise-4-0-4-0-1-4-0-2-LDAP-Authentication-Bypass
• https://hazelcast.zendesk.com/hc/en-us/articles/360051384932--JET-Enterprise-4-0-4-1-4-1-1-4-2-LDAP-Authentication-Bypass
• https://jet-start.sh/blog/2020/10/23/jet-43-is-released

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