NewsPublished 12 Jun 2026

Microsoft fixes Windows update failures linked to WUSA installer

Source Bleeping Computer

windows

Description

Microsoft has fixed a known issue that caused Windows updates released since May 2025 to fail when installed via the Windows Update Standalone Installer (WUSA) from a network share. [...]

Impact

The issue caused Windows updates to fail installation via WUSA when run from network shares with multiple .msu files, potentially disrupting patch deployment in enterprise environments using this method. It did not affect installations from single .msu files or local storage. The failure generated ERROR_BAD_PATHNAME, which could delay or prevent timely update application on affected systems.

Defensive guidance

Microsoft has officially fixed this issue in the June 2026 cumulative updates KB5079391 (Windows 11) and KB5094125 (Windows Server 2025). For systems not yet updated, a workaround is to save .msu files locally before installation. Additionally, after installing an update via WUSA, wait at least 15 minutes before checking the Update History to allow proper status reporting. No further action is required for home and non-managed business devices, as Microsoft mitigated the issue automatically via Known Issue Rollback starting September 2025.

References

bleepingcomputer.com/news/microsoft/microsoft-fixes-windows-update-failures-linked-to-wusa-installer/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 12 Jun 2026, 11:55 UTC

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