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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 SSSD 中发现了一个缺陷。在启用信任的身份管理环境中，SSSD 在评估基于主机的访问控制（HBAC）规则时，会剥离域名限定符，仅比较短用户名。如果受信任域中的经过身份验证的用户与某个已授权的本地账户具有相同的用户名，则可以绕过访问策略，从而获得对受保护服务或主机的未授权访问。

CVSS 6.8 · Medium

Affected Version Matrix 7

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
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I. Basic Information for CVE-2026-104048

Vulnerability Information
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Vulnerability Title
Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用错误要素进行比较
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-104048

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III. Intelligence Information for CVE-2026-104048

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Other References for CVE-2026-104048 (2)

Same Patch Batch · Red Hat · 2026-10-06 · 26 CVEs total

CVE-2026-106062 7.8 HIGH Gimp: gimp: heap buffer overflow in dds loader on crafted directdraw surface file
CVE-2026-101258 7.8 HIGH Ghostscript: ghostscript: -dsafer sandbox bypass via type 5 shading oob write and procedur
CVE-2026-83550 7.1 HIGH Postgres-exporter: net/http/pprof exposed on metrics listener
CVE-2026-92821 6.8 MEDIUM Sssd: sssd: access control bypass via premature ldap access rule evaluation
CVE-2026-106063 6.3 MEDIUM Gimp: gimp: heap buffer overflow in dicom export on oversized image dimensions
CVE-2026-104046 6.2 MEDIUM Sssd: sssd: denial of service via incomplete identity provider authentication requests
CVE-2026-104044 6.2 MEDIUM Sssd: sssd: denial of service via crafted passkey kerberos authentication request
CVE-2026-104038 5.9 MEDIUM Sssd: sssd: denial of service via missing sid extension in certificate mapping
CVE-2026-104036 5.8 MEDIUM Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
CVE-2026-104031 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in autofs responder
CVE-2026-104032 5.5 MEDIUM Sssd: sssd: denial of service via unprivileged autofs cache invalidation
CVE-2026-104035 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in kcm responder
CVE-2026-104037 5.5 MEDIUM Sssd: sssd: denial of service via packet length underflow in autofs responder
CVE-2026-104041 5.5 MEDIUM Sssd: sssd: denial of service via unbounded negative cache growth
CVE-2026-104042 5.5 MEDIUM Sssd: sssd: denial of service via out-of-bounds read in pam responder
CVE-2026-104043 5.5 MEDIUM Sssd: sssd: denial of service via undersized packet parsing in nss responder
CVE-2026-105305 5.4 MEDIUM Keycloak-services: keycloak-services: device authorization grant bypasses per-client minim
CVE-2026-106033 5.4 MEDIUM Ansible: ansible-ui: ansible ui dom xss in /redirect next parameter
CVE-2026-104033 5.4 MEDIUM Sssd: sssd: access control bypass via improper ldap shadow expiration check
CVE-2026-104047 5.3 MEDIUM Sssd: sssd: information disclosure via query injection in entra id lookups

Showing top 20 of 26 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-1025

V. Comments for CVE-2026-104048

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