CVE-2026-11861

Vendor solution

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Red Hat statement

This vulnerability is rated as Moderate because practical exploitation is significantly constrained by conditions that are unlikely to be met in most production environments. The attack requires a cross-realm trust to be configured between FreeIPA and Active Directory, the attacker must already hold a valid Active Directory account, and the impersonation technique depends on the ability to register a duplicate or conflicting Service Principal Name (SPN) in the Active Directory forest. Microsoft addressed this prerequisite by enforcing SPN and UPN uniqueness constraints on Windows Server 2012 R2 domain controllers with MSKB-3070083 applied, and by default on Windows 11 version 22H2 and later. In environments where the Active Directory domain controllers are patched and running a supported functional level, the attack path is blocked on the Windows side. Only deployments trusting an outdated or unpatched Active Directory environment remain realistically at risk, making this primarily a theoretical concern in modern, maintained environments.

Red Hat mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.