CVE-2026-65777

This vulnerability is a way to get around a built-in security guard in Windows Active Directory. If someone already has low-level access, they can use it over the network without needing anyone to click anything, potentially moving from a limited foothold to much more control. Think of it like having a key to a back door that should be locked, and finding a way to bypass that lock remotely.

This matters if your business uses Windows 11 or Windows Server 2022/2025 and those systems participate in a Windows Active Directory environment. The risk is primarily for attackers who already have low privileges (for example, a compromised account or account access inside your network). The attack does not require user interaction, so it’s focused on what’s reachable and where an attacker already has a foothold within your environment.

This is RED because exploitation has been reported as active in the wild. Microsoft released fixes in August 2026 Patch Tuesday, and the attacker path does not require user interaction, which increases real-world impact when a low-privileged attacker is present.