What is CVE-2026-18651?

CVE-2026-18651 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Improper Authentication. CVSS score: 5.4/10. Published 2026-08-03.

How severe is CVE-2026-18651?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Red Hat Directory Server 11

CVE-2026-18651

A flaw was found in 389 Directory Server. During SASL PLAIN authentication, the server installs connection-level bind credentials before performing the account-lock check. If the account is subsequently found to be locked, the bind is repo…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Red Hat Directory Server 11
Red Hat Directory Server 12
Red Hat Directory Server 13
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18651?: CVE-2026-18651 is a medium-severity vulnerability in Red Hat Directory Server 11, classified under Improper Authentication. CVSS score: 5.4/10. Published 2026-08-03.
How severe is CVE-2026-18651?: Medium severity. CVSS v3 base score is 5.4 out of 10.