Microsoft confirms Office apps launch issues after June updates

Source: BleepingComputer

Author: Sergiu Gatlan

URL: https://www.bleepingcomputer.com/news/microsoft/microsoft-confirms-office-apps-launch-issues-after-june-updates/

ONE SENTENCE SUMMARY:

Microsoft is investigating a Windows-update-triggered OLE automation issue blocking third-party apps from launching Office or opening documents reliably.

MAIN POINTS:

  1. A new known issue blocks third-party apps from launching Microsoft Office applications.
  2. Systems affected are fully updated with Windows patches released on/after June 9, 2026.
  3. Impacted Office products include Word, Excel, PowerPoint, Access, and others.
  4. Root cause involves third-party software using OLE automation to control Office.
  5. Failures may occur silently, with Office or documents not opening and no error.
  6. Reported affected apps include CCH Engagement, Zotero, and Workpaper Manager.
  7. Some vertical software is impacted, including dental tools like Dentrix and Softdent.
  8. Microsoft recommends opening Office apps/documents directly as a temporary workaround.
  9. Enterprises can request an organization-wide workaround via Microsoft Support for Business.
  10. A fix is being developed and will ship in a future Windows update.

TAKEAWAYS:

  1. Validate business-critical integrations that rely on Office OLE automation after June 2026 updates.
  2. Implement interim user guidance to launch Office directly rather than via third-party tools.
  3. Engage Microsoft Support for Business if widespread workflows are disrupted.
  4. Monitor Windows update releases for the promised remediation and related advisories.
  5. Expect silent failures, so add testing/monitoring to catch broken document-opening workflows.