Microsoft has confirmed it is investigating a problem that prevents third-party applications from launching Microsoft Office applications or opening documents on Windows systems that have received the latest June updates. The issue affects a range of Office products, though the company has not yet disclosed the full scope of impacted versions.
The severity of the disruption remains unclear, as Microsoft has not published a CVSS score or detailed the number of affected systems. However, the company acknowledged active reports of the problem, indicating it is affecting users who rely on third-party integrations to access Office files.
Technically, the bug appears to interfere with the ability of external software to invoke Office applications programmatically. Microsoft has not released specific indicators of compromise or an exploit mechanism, as the issue is classified as a functionality fault rather than a security vulnerability. The root cause is tied to the June 2025 cumulative updates for Windows.
Users experiencing the glitch have no official workaround yet. Microsoft is investigating and has promised to provide updates as more information becomes available. No patch or timeline for a fix has been issued. Affected users may need to temporarily open Office files directly from within the applications themselves.
Microsoft has not attributed the problem to any specific third-party software or external actor. The company is likely coordinating with partners to identify the exact trigger and develop a resolution. Users are advised to monitor Microsoft's support channels for further announcements.