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CVE-2026-18651

389-ds-base: 389-ds-base: sasl plain bind installs connection credentials before account-lock check, allowing continued access as a locked account

5.4 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.28%Up 0.1 points since Aug 4, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.4

389-ds-base: 389-ds-base: sasl plain bind installs connection credentials before account-lock check, allowing continued access as a locked account

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.

Record
CVE-2026-18651
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-287
Updated
2026-11-05
EUVDEUVD-2026-52328 5.4

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.

Record
EUVD-2026-52328
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-05
GitHub AdvisoriesGHSA-q924-9ph6-5h92 5.4

A flaw was found in 389 Directory Server. During SASL PLAIN authentication, the server installs...

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.

Record
GHSA-q924-9ph6-5h92
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-287
Updated
2026-11-02
NVD 5.4

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.

Record
CVE-2026-18651
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-287
Updated
2026-11-05
OSVDEBIAN-CVE-2026-18651 5.4

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.

Record
DEBIAN-CVE-2026-18651
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-18651 5.4

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.

Record
UBUNTU-CVE-2026-18651
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVAZL-94517 No score

CVE-2026-18651 affecting package 389-ds-base 3.1.1-12

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.

Record
AZL-94517
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
389-ds-base
Azure Linux:3
through 3.1.1-12 None known
389-ds-base
Debian:12
All versions, plus listed versions
2.3.1+dfsg1-12.3.1+dfsg1-1+deb12u12.3.4+dfsg1-12.3.4+dfsg1-1.12.4.4+dfsg1-1
Show 13 moreShow less
2.4.4+dfsg1-32.4.5+dfsg1-13.0.2+dfsg1-13.1.1+dfsg1-13.1.1+dfsg1-23.1.1+dfsg1-33.1.2+dfsg1-13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3
None known
389-ds-base
Debian:13
All versions, plus listed versions
3.1.2+dfsg1-13.1.2+dfsg1-1+deb13u13.1.2+vendor1-13.1.2+vendor1-23.3.0-13.3.0-23.3.1-13.3.1-3
None known
389-ds-base
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.3.3.12-1build11.3.3.13-11.3.4.5-21.3.4.8-11.3.4.8-3
Show 4 moreShow less
1.3.4.8-3ubuntu11.3.4.8-41.3.4.9-11.3.4.9-1ubuntu0.1~esm1
None known
389-ds-base
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.3.7.5-11.3.7.5-1build11.3.7.5-1build21.3.7.9-11.3.7.10-11.3.7.10-1ubuntu11.3.7.10-1ubuntu1+esm1
None known
389-ds-base
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.4.1.6-41.4.1.6-4build11.4.2.4-11.4.2.4-1build11.4.3.2-11.4.3.2-1build11.4.3.6-21.4.3.6-2ubuntu0.1~esm1
None known
389-ds-base
Ubuntu:22.04:LTS
All versions, plus listed versions
1.4.4.11-2build11.4.4.11-2build21.4.4.17-12.0.11-22.0.14-12.0.15-12.0.15-1ubuntu2
None known
389-ds-base
Ubuntu:24.04:LTS
All versions, plus listed versions
2.3.4+dfsg1-12.4.4+dfsg1-1ubuntu12.4.4+dfsg1-1ubuntu42.4.4+dfsg1-32.4.5+dfsg1-1
None known
389-ds-base
Ubuntu:26.10
All versions, plus listed versions
3.1.2+vendor1-23.1.2+vendor1-2build13.3.1-3
None known
389-ds-base
Ubuntu:26.04:LTS
All versions, plus listed versions
3.1.2+dfsg1-13.1.2+vendor1-2
None known

History

History
RecordedChangedSources
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-18651 is a medium vulnerability (CVSS 5.4) in Redhat 389 Directory Server, published August 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. No source names a fixed version.

References

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