Medium 6.8Published Oct 6, 2026

CVE-2026-104048Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation

Updated under an hour ago (2026-10-19 09:50 UTC)

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It affects Red Hat Enterprise Linux 10 and 3 other products. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.28%, higher than 19% of scored CVEs.

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Every CVE for Red Hat Enterprise Linux 10

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-1025
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.28% (percentile 19)
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CNA record
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CNA record
fedoraproject sssd fedoraproject:sssd	2.12.0	NVD
redhat openshift_container_platform redhat:openshift_container_platform	4.0	NVD
redhat enterprise_linux redhat:enterprise_linux	7.0; 8.0; 9.0; 10.0	NVD

References

https://access.redhat.com/security/cve/CVE-2026-104048vdb-entry, x-refsource-redhat, vendor-advisory, issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2478613issue-tracking, x-refsource-redhat, exploit, mitigation, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.