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389 Directory Server EUVDEUVD-2026-52328

| CVE-2026-18651 MEDIUM
Improper Authentication (CWE-287)
2026-08-03 redhat GHSA-q924-9ph6-5h92
Authentication Bypass 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 Red Hat Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 Red Hat
5.4
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
vuln.today AI
5.4 MEDIUM

Network-reachable LDAP service; valid credential required for locked account (PR:L); impact bounded to that account's directory ACL grants with no scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.4 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 03, 2026 - 15:51 vuln.today
CVE Published
Aug 03, 2026 - 14:55 cve.org
MEDIUM 5.4

DescriptionCVE.org

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 reported as failed to the client, but the already-installed authenticated state on the connection is not reverted. A client that supplies valid credentials for an account that has been administratively locked can continue to use the same connection with that account's privileges, defeating account lock as an access-revocation control.

AnalysisAI

Authentication bypass in 389 Directory Server (Red Hat Directory Server 11-13) allows a network-connected user holding valid credentials for an administratively locked account to retain an authenticated LDAP session, defeating account-lock as an access-revocation control. The SASL PLAIN bind handler installs connection-level authenticated state before executing the account-lock check; when the lock check fails, only the error is returned to the client while the internal authenticated state on that connection persists unrevertd. No public exploit has been identified at time of analysis and no CISA KEV listing exists, but the real-world impact is highest in incident-response and employee-offboarding scenarios that rely on directory lock as the primary revocation mechanism.

Technical ContextAI

389 Directory Server (upstream of Red Hat Directory Server) is an enterprise LDAP service widely deployed on RHEL. SASL PLAIN is a simple authentication mechanism that transmits a username and password in cleartext within a SASL exchange - typically protected by TLS at the transport layer. The vulnerability is a sequencing flaw in the bind processing pipeline: per the description, the server calls the internal routine that installs authenticated bind credentials on the connection object before it checks account-lock status. This violates atomicity - a successful bind should only be committed if every validation step passes. CWE-287 (Improper Authentication) identifies the root cause class: an operation that should either fully succeed or fully fail instead leaves the system in a partially-committed authenticated state. The result is that the connection object, which tracks session-level authorization for subsequent LDAP operations, reflects the locked account's privileges despite the bind nominally reporting failure.

RemediationAI

Patch available per vendor advisory - apply the Red Hat-issued errata for 389 Directory Server as published at https://access.redhat.com/security/cve/CVE-2026-18651; exact fixed package versions are not independently confirmed from the available references and must be verified against the official advisory. Until patching is complete, the most effective compensating control is to supplement account locking with an immediate password reset for any account being revoked - since the flaw requires a valid password, invalidating the password eliminates the exploit precondition, with no meaningful side effect beyond the intended revocation. As a secondary control, disabling the SASL PLAIN mechanism in the directory server configuration (via the nsslapd-allowed-sasl-mechanisms attribute) removes the vulnerable code path entirely, but will break any clients that exclusively use SASL PLAIN and may require client reconfiguration to use SASL GSSAPI, EXTERNAL (certificate), or DIGEST-MD5. Network-layer ACLs restricting LDAP (port 389) and LDAPS (port 636) access to known trusted client hosts limit the set of potential attackers who could establish the initial connection.

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Same weakness CWE-287 – Improper Authentication

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Same technique Authentication Bypass

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CVE-2023-46805 HIGH POC
8.2

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server 16.1 Affected

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EUVD-2026-52328 vulnerability details – vuln.today
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