This month isn’t a good time for IT admins to take a break if they want to stay ahead of the latest patches from Microsoft. The August Patch Tuesday release includes a hefty list of 111 fixes that affect Windows, Office, SQL Server, and Exchange Server. Some of these updates are urgent and come with “Patch Now” recommendations.

Several vulnerabilities need immediate attention. For example, Windows has a flaw in its Kerberos authentication system (CVE-2025-53779), and Microsoft SQL Server also faces a serious security issue (CVE-2025-49719). Both could be exploited if not patched quickly. Additionally, a severe Exchange Server vulnerability (CVE-2025-53786) has been flagged by CISA, especially for government systems that rely heavily on Exchange. Office applications are also on the “Patch Now” list because of a vulnerability related to the preview pane (CVE-2025-53740), which could allow malicious code to run if exploited.

While some Microsoft products like their browsers and Visual Studio development platform are on a regular update schedule, the rest present a complex patching landscape. To help IT teams navigate these updates, Microsoft’s Readiness team created an infographic that highlights the risks of deploying each patch to various platforms. This visual guide can help admins prioritize their testing and deployment efforts.

Known Issues and Special Considerations

Interestingly, this month’s known issues don’t involve Windows itself but focus on two Microsoft server products. The first is Microsoft Exchange Server, where the Edge Transport service (EdgeTransport.exe) might stop responding and then restart unexpectedly. Microsoft has provided workarounds for this issue. The second involves SharePoint Server; after installing the update, users might encounter an error with calendar overlay settings related to an “Invalid EWS URL.” This specific issue is documented in Microsoft’s knowledge base under the title “Invalid EWS URL in Overlay settings.”

Major Updates and How They Affect Your Systems

This month’s patch release includes more than usual updates and changes to existing patches. Microsoft provided a streamlined list highlighting the most critical updates that require immediate action. One notable patch addresses an elevation of privilege vulnerability in Exchange Server (CVE-2025-53786). This flaw was not fixed in earlier updates, so organizations should prioritize patching it promptly.

Another important update concerns the .NET Framework. Microsoft had previously provided technical workarounds for a remote code execution vulnerability (CVE-2022-41089), but these are now obsolete. Microsoft recommends removing any previous mitigations. There’s also a vulnerability related to GitHub’s WiX Burn-based bundles (CVE-2024-29187), which could be exploited for binary hijacking, especially on older Windows builds like version 1607.

Windows Lifecycle and Upcoming End-of-Service Dates

Microsoft didn’t announce any enforcement updates this month, but some products are nearing their end of support. Support for Windows Server 2008 will end in January 2026, including the Premium Assurance program. Also, Microsoft will start removing PowerShell 2.0 from Windows this month. The deprecated version will be turned off by default, eight years after Microsoft announced its retirement.

The updates this month affect core Windows components and have particular implications for printing systems and remote desktop authentication. These areas are high-risk and should be tested thoroughly. For example, updates to the printing subsystem could impact printing across the enterprise, so validating printing scenarios—especially from 32-bit applications—is crucial. Similarly, remote desktop updates affect authentication methods such as Kerberos, NTLM, and Azure AD tokens, which means IT teams should test login procedures, session timeouts, MFA prompts, and network connectivity.

Filesystem and storage components also received updates. These changes affect how Windows handles directory queries and file operations, so testing should include access to SMB shares, handling of short filenames, and .lnk shortcut files.

Media and codecs aren’t left out. Updates to media playback components require validation by watching videos, especially with subtitles, and testing image embedding and capture features. Application deployment updates, including Windows Installer and App Silos, also need validation to ensure software installs, uninstalls, and repairs work smoothly.

In summary, this month’s patches are complex but critical. IT teams should prioritize testing and deploying these updates quickly, focusing on the most high-risk components first. Staying on top of these patches helps keep systems secure and running smoothly.

Inspired by

• https://www.computerworld.com/article/4040496/for-august-a-complex-patch-tuesday-with-111-updates.html

Sources

• gmpg.org
• microsoft.com
• cve-2025-49719
• microsoft.com
• microsoft.com