CVE-2026-104048
Red Hat Enterprise Linux 10: Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation
Red Hat Red Hat Enterprise Linux 10Operating systems
CVSS
6.8MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 7 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List