Vulnerability-Lookup

RHSA-2026:64811

Vulnerability from csaf_redhat - Published: 2026-09-08 04:05 - Updated: 2026-09-14 23:48

Summary

Red Hat Security Advisory: 389-ds-base security update

Severity

Critical

Notes

Topic: An update for 389-ds-base is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration. Security Fix(es): * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property (CVE-2026-18922) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-18922

A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following a subsequent, unrelated successful bind, regardless of which SASL mechanism completes that second bind. An attacker can send a SASL PLAIN bind as cn=Directory Manager with an incorrect password, then complete a SASL ANONYMOUS bind on the same connection, causing the server to grant Directory Manager authority without any valid credentials. A variant using a valid low-privileged account's own successful bind instead of an anonymous one is also possible.

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-287 - Improper Authentication

Affected products

Fixed 11 products

Product	Version	Remediation
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-0:1.2.11.15-97.el6_10.1.i686	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-0:1.2.11.15-97.el6_10.1.src	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-0:1.2.11.15-97.el6_10.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.i686	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-libs-0:1.2.11.15-97.el6_10.1.i686	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-ELS.EXTENSION:389-ds-base-libs-0:1.2.11.15-97.el6_10.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-optional-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.i686	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-optional-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-optional-ELS.EXTENSION:389-ds-base-devel-0:1.2.11.15-97.el6_10.1.i686	—	Vendor Fix fix Workaround
Unresolved product id: 6Server-optional-ELS.EXTENSION:389-ds-base-devel-0:1.2.11.15-97.el6_10.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Critical

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:64811	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2511388	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-18922	self
https://bugzilla.redhat.com/show_bug.cgi?id=2511388	external
https://www.cve.org/CVERecord?id=CVE-2026-18922	external
https://nvd.nist.gov/vuln/detail/CVE-2026-18922	external

Acknowledgments

OpenAI Security Research Chris Jarrett-Davies

JSON

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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
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          "organization": "OpenAI Security Research"
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      "cve": "CVE-2026-18922",
      "cwe": {
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        "name": "Improper Authentication"
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      "discovery_date": "2026-07-30T09:58:58+00:00",
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          "text": "A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following a subsequent, unrelated successful bind, regardless of which SASL mechanism completes that second bind. An attacker can send a SASL PLAIN bind as cn=Directory Manager with an incorrect password, then complete a SASL ANONYMOUS bind on the same connection, causing the server to grant Directory Manager authority without any valid credentials. A variant using a valid low-privileged account\u0027s own successful bind instead of an anonymous one is also possible.",
          "title": "Vulnerability description"
        },
        {
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          "text": "389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw is rated Critical because it allows a remote, unauthenticated attacker to gain full Directory Manager privileges over an LDAPS connection \u2014 with no valid account, no user interaction, and no non-default configuration required. Flaw is exploitable by a remote unauthenticated attacker that fully compromises confidentiality, integrity, and availability without requiring user interaction.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-18922"
        },
        {
          "category": "external",
          "summary": "RHBZ#2511388",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511388"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18922",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-18922"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18922",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18922"
        }
      ],
      "release_date": "2026-09-07T12:33:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-08T04:05:27+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
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            "6Server-ELS.EXTENSION:389-ds-base-libs-0:1.2.11.15-97.el6_10.1.i686",
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            "6Server-optional-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.i686",
            "6Server-optional-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.x86_64",
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            "6Server-optional-ELS.EXTENSION:389-ds-base-devel-0:1.2.11.15-97.el6_10.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:64811"
        },
        {
          "category": "workaround",
          "details": "Administrators can restrict nsslapd-allowed-sasl-mechanisms to only the mechanisms actually required (e.g. GSSAPI, EXTERNAL, GSS-SPNEGO), excluding PLAIN. Since the exploit chain requires the first bind attempt to be a failed SASL PLAIN bind as cn=Directory Manager, removing PLAIN from the allowed mechanism list prevents that step entirely \u2014 this blocks both the originally reported variant (valid low-privileged account) and the zero-credential SASL ANONYMOUS variant, since both depend on the same initial PLAIN bind to plant the stale identity.",
          "product_ids": [
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "6Server-ELS.EXTENSION:389-ds-base-0:1.2.11.15-97.el6_10.1.src",
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            "6Server-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.i686",
            "6Server-ELS.EXTENSION:389-ds-base-debuginfo-0:1.2.11.15-97.el6_10.1.x86_64",
            "6Server-ELS.EXTENSION:389-ds-base-libs-0:1.2.11.15-97.el6_10.1.i686",
            "6Server-ELS.EXTENSION:389-ds-base-libs-0:1.2.11.15-97.el6_10.1.x86_64",
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            "6Server-optional-ELS.EXTENSION:389-ds-base-devel-0:1.2.11.15-97.el6_10.1.i686",
            "6Server-optional-ELS.EXTENSION:389-ds-base-devel-0:1.2.11.15-97.el6_10.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property"
    }
  ]
}

CVE-2026-18922 (GCVE-0-2026-18922)

Vulnerability from cvelistv5 – Published: 2026-09-07 14:14 – Updated: 2026-09-08 13:04

Title

389-ds-base: 389-ds-base: sasl plain authentication allows privilege escalation to directory manager via stale identity in cyrus sasl auxiliary property

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 13:04 UTC

CWE

CWE-287 - Improper Authentication

Assigner

redhat redhat root

References

18 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:64771	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64776	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64778	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64779	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64780	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64781	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64783	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64784	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64785	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64789	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64790	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64791	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64792	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64793	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64804	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:64811	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18922	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2511388	issue-trackingx_refsource_REDHAT

Impacted products

21 products

Vendor	Product	Version
Red Hat	Red Hat Directory Server 11.7 E4S for RHEL 8	Unaffected: 8080020260903102346.f969626e , < * (rpm) cpe:/a:redhat:directory_server_e4s:11.7::el8
Red Hat	Red Hat Directory Server 11.9 for RHEL 8	Unaffected: 8100020260904171440.37ed7c03 , < * (rpm) cpe:/a:redhat:directory_server:11.9::el8
Red Hat	Red Hat Directory Server 12.2 E4S for RHEL 9	Unaffected: 9020020260903155914.1674d574 , < * (rpm) cpe:/a:redhat:directory_server_e4s:12.2::el9
Red Hat	Red Hat Directory Server 12.4 E4S for RHEL 9	Unaffected: 9040020260903102623.1674d574 , < * (rpm) cpe:/a:redhat:directory_server_e4s:12.4::el9
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.2.0-10.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:3.0.6-21.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	Unaffected: 0:1.2.11.15-97.el6_10.1 , < * (rpm) cpe:/o:redhat:rhel_els:6
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	Unaffected: 0:1.3.11.1-15.el7_9 , < * (rpm) cpe:/o:redhat:rhel_els:7
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260904155442.25e700aa , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	Unaffected: 8040020260901171549.96015a92 , < * (rpm) cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	Unaffected: 8040020260901171549.96015a92 , < * (rpm) cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	Unaffected: 8060020260901145727.824efc52 , < * (rpm) cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	Unaffected: 8060020260901145727.824efc52 , < * (rpm) cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	Unaffected: 8080020260831180218.6dbb3803 , < * (rpm) cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	Unaffected: 8080020260831180218.6dbb3803 , < * (rpm) cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.8.0-10.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 0:2.2.4-22.el9_2 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:2.4.5-29.el9_4 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:2.6.1-24.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6::appstream cpe:/a:redhat:rhel_eus:9.6::crb
Red Hat	Red Hat Directory Server 12	cpe:/a:redhat:directory_server:12
Red Hat	Red Hat Directory Server 13	cpe:/a:redhat:directory_server:13

Date Public

2026-09-07 12:33

Credits

Red Hat would like to thank Chris Jarrett-Davies (OpenAI Security Research) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.