Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 – < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 2019 | 19.0.0 – < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 – < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 – < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 – < 16.106.26020821 | 16.106.26020821 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 – < 16.106.26020821 | 16.106.26020821 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 – < 16.0.5539.1002 | 16.0.5539.1002 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 – < 16.0.10417.20097 | 16.0.10417.20097 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 – < 16.0.19127.20518 | 16.0.19127.20518 |
| Microsoft | Microsoft Word 2016 | 16.0.1 – < 16.0.5539.1002 | 16.0.5539.1002 |
Advisories 3
- MSRC-CVE-2026-21511 Microsoft Outlook Spoofing Vulnerability Microsoft Security Response Center · Feb 11, 2026
- WID-SEC-2026-0371 Microsoft Office: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 10, 2026
- NCSC-2026-0058 Kwetsbaarheden verholpen in Microsoft Office NCSC-NL (Netherlands) · Feb 10, 2026
References
- Microsoft Outlook Spoofing Vulnerability vendor-advisory patch