# CVE-2026-104048: Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation Status: published. Published: 2026-10-06. Updated: 2026-11-05. A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based Access Control (HBAC) rules by stripping domain qualifiers and comparing only short usernames. An authenticated user in a trusted domain who shares the same username as an authorized local account can bypass access policies and gain unauthorized access to protected services or hosts. ## Remediation - workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat) ## Affected products and versions - Red Hat / Red Hat Enterprise Linux 10 (sssd): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 6 (sssd): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 7 (sssd): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8 (sssd): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 9 (sssd): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat OpenShift Container Platform 5 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat ## NVD configuration conditions Affected CPE matches depend on the following AND/OR and negation conditions: ```json [ { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:fedoraproject:sssd:2.12.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" } ] ``` ## Severity and prioritization - CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N; source: CNA: redhat - CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N; source: NVD: nvd@nist.gov - CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N; source: NVD: secalert@redhat.com - CISA KEV: No listing in collected sources - EPSS: 0.30% as of 2026-11-05; percentile 23.02% - SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP - Weaknesses: CWE-1025 ## Exploit evidence - exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (ADP: CISA-ADP) - exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (secalert@redhat.com) - exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (134c704f-9b21-4f2e-91b3-4a467353bcc0) ## References - https://access.redhat.com/security/cve/CVE-2026-104048 (CNA: redhat; vdb-entry, x_refsource_REDHAT) - https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (CNA: redhat; issue-tracking, x_refsource_REDHAT) - https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (ADP: CISA-ADP; exploit) - https://access.redhat.com/security/cve/CVE-2026-104048 (secalert@redhat.com; Issue Tracking, Vendor Advisory) - https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (secalert@redhat.com; Exploit, Issue Tracking, Mitigation, Vendor Advisory) - https://bugzilla.redhat.com/show_bug.cgi?id=2478613 (134c704f-9b21-4f2e-91b3-4a467353bcc0; Exploit, Issue Tracking, Mitigation, Vendor Advisory) ## Provenance - CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-104048; retrieved 2026-11-05; source updated 2026-11-05 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104048; retrieved 2026-11-05; source updated 2026-11-05 - FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-104048; retrieved 2026-11-05; source updated Not reported Revision: b3dd9440631271251c120a9486c39f7576f838b18a173b2bdc8499022f450b81 Canonical: https://y2.dev/cve/CVE-2026-104048 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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