# CVE-2026-104048: SSSD authorization bypass via username collision in HBAC

Source: https://junglewise.ai/threats/cve-2026-104048-a-flaw-was-found-in-sssd-in-trust-enabled-identity-management  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-104048 · Severity: medium · CVSS 6.8 · Published 2026-10-06

SSSD is an identity management daemon that enforces Host-Based Access Control (HBAC) policies to restrict which users can access protected hosts and services. A flaw in how SSSD evaluates these policies in trusted domain environments allows an authenticated user in a trusted domain to bypass access restrictions if their username matches a local account explicitly listed in an allow rule, potentially gaining unauthorized access to protected systems.

Technologies: [Red Hat SSSD](https://junglewise.ai/threats/technologies/red-hat-sssd). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-104048 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104048 being exploited in the wild.

**How severe is CVE-2026-104048?** Medium severity, with a CVSS score of 6.8, published 6 October 2026.

**Which products and versions are affected?** Red Hat SSSD <UNKNOWN>.

**Is there a fix for CVE-2026-104048?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-104048 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-104048?** Check whether you run Red Hat SSSD at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

SSSD improperly evaluates HBAC rules in cross-realm trust deployments by stripping domain qualifiers from usernames and comparing only short usernames, leading to CWE-1025 (Comparison Using Wrong Factors). An authenticated user in a trusted domain with a username matching a local Identity Management user listed in an allow rule can bypass HBAC restrictions. Exploitation requires a non-default trust configuration and username collision between domains; unauthenticated remote exploitation is not possible.

## Affected products

- Red Hat SSSD <UNKNOWN>

## Timeline

- 2026-10-06: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-104048](https://access.redhat.com/security/cve/CVE-2026-104048)

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