BlueHammer: The Unpatched Windows Privilege Escalation Exploit
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Overview
Disclosed on April 3, 2026, BlueHammer is an unpatched Windows privilege escalation vulnerability lacking a CVE or official fix. It exploits a TOCTOU race condition across Microsoft Defender, VSS, Cloud Files API, and oplocks. This flaw allows unprivileged attackers to access credential hives, decrypt NTLM hashes, and gain full SYSTEM-level control before covering their tracks.
Article Link: BlueHammer: The Unpatched Windows Privilege Escalation Exploit
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