High severity · published Oct 6, 2026
CVE-2026-104048
Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0; 10.0 · source: NVD
OC
Openshift Container Platform · Redhat
4.0 · source: NVD
SS
Sssd · Fedoraproject
2.12.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104048
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104048
vdb-entry
https://access.redhat.com/security/cve/CVE-2026-104048
issue-tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2478613
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