CVE-2026-96219

Summary

An out-of-bounds write vulnerability in Windows LSASS allows remote attackers to execute arbitrary code with high privileges. This flaw occurs when LSASS processes authentication requests, potentially enabling full system compromise without requiring user interaction.

Exploitability

Exploitation is likely straightforward for remote attackers with minimal preconditions, as the vulnerability exists in the core authentication service and can be triggered over the network without authentication.

Blast radius

If exploited, this vulnerability could impact all Windows systems running LSASS, potentially allowing attackers to gain domain administrator privileges and move laterally across the entire network infrastructure.

Detection

Monitor for unusual LSASS process memory access patterns and unexpected authentication failures in Security Event Logs (Event ID 4624) that occur during high-volume authentication requests.

Prioritized remediation

Apply the latest Windows security updates immediately, specifically the patch released in the August 2026 Update KB5067890 or later.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.