"Microsoft confirms that there is a problem in the recent security update KB5063878. Specifically, it concerns an error that occurs when performing repairs on applications that use Windows Installer (MSI). According to the official documentation, this can lead to unexpected User Account Control prompts when a user without administrator rights performs an MSI repair. Known packages affected by this include Autodesk AutoCAD and older versions of Office, such as Office Professional Plus 2010."
"The bug appeared in Windows Server 2025 after the installation of update KB5063878, which was rolled out on August 12, 2025. Microsoft acknowledges that the issue is problematic for administrators and end users who rely on MSI-based installations and repairs, especially in business environments where not every user has administrator rights. The unexpected request for additional access rights causes disruptions in daily use and complicates the management of software on a larger scale."
"In the status page for Windows Server 2025, Microsoft indicates that the issue was mitigated on September 3, 2025. This means that a solution is available and most organizations should no longer be affected by this error. In addition to this bug, Microsoft also reported another issue with installation via Windows Server Update Services on the same page. Error code 0x80240069 could occur when rolling out updates. That issue has also been resolved, restoring the reliability of the update process."
Update KB5063878 caused an error that triggers unexpected User Account Control prompts when users without administrator rights perform MSI repairs. Known affected packages include Autodesk AutoCAD and older Office versions such as Office Professional Plus 2010. The bug appeared after the update rolled out on August 12, 2025, and disrupted business environments where users lack admin rights, complicating software management and daily use. Microsoft acknowledged the problem and indicated a mitigation on September 3, 2025. Microsoft also resolved a related WSUS installation issue that could present error code 0x80240069, restoring update deployment reliability for most organizations.
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