CVE-2026-18922

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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."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Directory Server 11.5 E4S for RHEL 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11", "defaultStatus": "affected", "versions": [{"version": "8060020260908152739.0ca98e7e", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:directory_server_e4s:11.5::el8"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 11.7 E4S for RHEL 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11", "defaultStatus": "affected", "versions": [{"version": "8080020260903102346.f969626e", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:directory_server_e4s:11.7::el8"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 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"defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:directory_server:13"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:64771", "name": "RHSA-2026:64771", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64776", "name": "RHSA-2026:64776", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64778", "name": "RHSA-2026:64778", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64779", "name": "RHSA-2026:64779", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64780", "name": "RHSA-2026:64780", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64781", "name": "RHSA-2026:64781", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:64783", "name": 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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."}], "timeline": [{"lang": "en", "time": "2026-07-30T09:58:58.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-09-07T12:33:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Chris Jarrett-Davies (OpenAI Security Research) for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-08T14:14:57.932Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T13:04:02.842508Z", "id": "CVE-2026-18922", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T13:04:34.933Z"}}]}}

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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."}], "id": "CVE-2026-18922", "lastModified": "2026-10-08T15:17:52.813", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18922", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T13:04:02.842508Z", "version": "2.0.3"}}]}, "published": "2026-09-07T15:17:31.157", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64771"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64776"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64778"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64779"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64780"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64781"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64783"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64784"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64785"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64789"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64790"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64791"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64792"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64793"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64804"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:64811"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:79217"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-18922"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511388"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Chris Jarrett-Davies (OpenAI Security Research) for reporting this issue.", "bugzilla": {"description": "389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property", "id": "2511388", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511388"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-287", "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-18922", "package_state": [{"cpe": "cpe:/a:redhat:directory_server:11", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Directory Server 11"}, {"cpe": "cpe:/a:redhat:directory_server:12", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Directory Server 12"}, {"cpe": "cpe:/a:redhat:directory_server:13", "fix_state": "Not affected", "package_name": "389-ds-base", "product_name": "Red Hat Directory Server 13"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "389-ds:1.4/389-ds-base", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-07T12:33:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-18922\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-18922"], "statement": "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.", "threat_severity": "Critical"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 92.0, "confidence_source": "matching", "scores": [{"score": 92.0, "source": "matching"}]}, "original": {"product": "Red Hat Directory Server 11", "source": "cna", "vendor": "Red Hat"}, "product": "redhat_directory_server", "vendor": "redhat"}], "created": "2026-09-07T15:45:17.420901+00:00", "updated": "2026-09-08T20:36:54.477553+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$redhat_directory_server"]}