Microsoft Fixes 751 Vulnerabilities in August Patch Tuesday

Microsoft's August 2026 security release addresses 751 CVE entries across its product lines, designating 108 of them as critical. At the top of the priority list is CVE-2026-68820, an actively exploited elevation of privilege vulnerability residing in the Windows WinSock driver (afd.sys). Security teams must also contend with two other publicly disclosed but not yet exploited flaws: CVE-2026-62832 in the User Profile Service and CVE-2026-72971.

Infrastructure administrators face significant exposure, particularly within network services. The Windows DHCP Server is the most heavily patched component with 14 entries, led by the critical remote code execution (RCE) vulnerability CVE-2026-62823. Meanwhile, Windows DNS Server features four critical RCEs: CVE-2026-62878, CVE-2026-62817, CVE-2026-62820, and CVE-2026-65789. On-premises Exchange Server also requires urgent attention, receiving seven CVEs including the critical elevation of privilege flaw CVE-2026-62911 and the RCE vulnerability CVE-2026-62913.

For client environments, the update delivers 120 Office CVEs, with 24 rated critical. The risk heavily impacts Click-to-Run deployments, as 89 of these vulnerabilities affect Microsoft 365 Apps for Enterprise, highlighted by the critical RCE CVE-2026-70130. On-premises SharePoint Server installations require patches for three critical vulnerabilities, including the RCE CVE-2026-65665. Developers are not spared, with 23 CVEs spanning .NET, the .NET Framework, and Visual Studio Code, including the RCEs CVE-2026-62897 and CVE-2026-70354.

To manage this massive rollout, practitioners should structure their testing around high-risk areas first. Initial validation should focus on printing and font rendering, as the win32kfull.sys binary contains seven patches, including three of the release's four high-risk flags. The fourth high-risk flag affects the Remote Desktop client, requiring thorough validation of redirection paths and concurrent sessions. Finally, administrators should perform a WinSock smoke test to mitigate the exploited afd.sys flaw before moving on to lower-risk areas like Telephony, Active Directory, and the SMB stack.