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CVE-2025-27727 is a local elevation-of-privilege vulnerability in Microsoft Windows Installer. The flaw stems from improper link resolution and unsafe trust of attacker-influenced folder deletion metadata during privileged cleanup operations. A low-privileged local user can use the Windows Installer transaction workflow to supply an arbitrary directory path through the Installer COM interface, causing the MSI service, which runs as SYSTEM, to later process that path as a scheduled temporary package location and recursively delete it without verifying that the directory was originally created and owned by the installer. The vulnerable behavior is associated with the transaction-related call chain involving MsiBeginTransactionW(), CMsiTransaction::SetEEUIDirectoryAndFilter(), scheduling of deletion state in the Installer temporary package tracking mechanism, and subsequent privileged cleanup in CleanupTempPackages(). Because the service performs the deletion with elevated privileges and insufficient validation of the target path, the issue creates a SYSTEM-privileged arbitrary folder deletion primitive. The described exploitation path further shows that deletion and recreation of installer-related directories can be leveraged to plant malicious rollback script content and obtain SYSTEM code execution.
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A logic vulnerability in the Microsoft Windows Installer COM interface (msi.dll / msiexec.exe) that lets a low-privileged user schedule an arbitrary folder for deletion by the SYSTEM-level MSI service, enabling privilege escalation to SYSTEM.
Windows Installer elevation of privilege vulnerability that Microsoft assesses as more likely to be exploited within 30 days.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.