Microsoft’s August 2026 Patch Tuesday addressed hundreds of CVEs, including CVE-2026-68820 — an actively exploited elevation-of-privilege zero-day in the Windows Ancillary Function Driver for WinSock.
Patching matters, but the real question is what an attacker could do once inside: how far they would escalate and how quickly they could move toward domain admin.
Our analysis
Elevation-of-privilege zero-days rarely make headlines, but they are the workhorse of real intrusions. Attackers pair a phishing foothold with an EoP like this to jump from a low-privileged user to SYSTEM in seconds. Because it was exploited before a patch existed, you should assume some environments were already hit and treat this as an incident-response trigger, not just a patching task.
What you should do
- Deploy the August 2026 updates now, prioritising the exploited WinSock EoP on workstations.
- Hunt for post-exploitation indicators — new local admins, suspicious child processes, token manipulation — on hosts that were unpatched.
- Enforce least privilege and tiered administration so a single EoP cannot reach domain admin.
- Confirm EDR coverage on every endpoint, not just servers.
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Source: SecurityWeek / Tenable.