| CVE Number | Vulnerability | Product | Severity | Date |
|---|---|---|---|---|
| CVE-2026-45458 | Microsoft Outlook and Word Remote Code Execution Vulnerability | Microsoft Office, Microsoft 365 Apps, Microsoft SharePoint, Microsoft Word | Critical | 01-07-2026 |
Technical Information
An unauthenticated attacker can exploit this by triggering a type confusion due to use-after-free condition that results in arbitrary code execution on the affected machine.
Patch release date: Jun 09, 2026
Further information on this vulnerability is available at : CVE-2026-45458
Affected Software
Microsoft Office 365 for Mac,Microsoft SharePoint Enterprise Server 2016,
Microsoft SharePoint Server 2019,
Microsoft Office 2019 for 32-bit editions,
Microsoft Office 2019 for 64-bit editions,
Microsoft 365 Apps for Enterprise for 32-bit Systems,
Microsoft 365 Apps for Enterprise for 64-bit Systems,
Microsoft Office LTSC for Mac 2021,
Microsoft Office LTSC 2021 for 64-bit editions,
Microsoft Office LTSC 2021 for 32-bit editions,
Microsoft SharePoint Server Subscription Edition,
Microsoft Office LTSC 2024 for 32-bit editions,
Microsoft Office LTSC 2024 for 64-bit editions,
Microsoft Office LTSC for Mac 2024,
Microsoft Word 2016 (32-bit edition),
Microsoft Word 2016 (64-bit edition)