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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-21511

Microsoft Outlook Spoofing Vulnerability

Description

Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Microsoft Microsoft 365 Apps for Enterprise

  • 16.0.1 to < https://aka.ms/OfficeSecurityReleasesaffected

Microsoft Microsoft Office 2019

  • 19.0.0 to < https://aka.ms/OfficeSecurityReleasesaffected

Microsoft Microsoft Office LTSC 2021

  • 16.0.1 to < https://aka.ms/OfficeSecurityReleasesaffected

Microsoft Microsoft Office LTSC 2024

  • 16.0.0 to < https://aka.ms/OfficeSecurityReleasesaffected

Microsoft Microsoft Office LTSC for Mac 2021

  • 16.0.1 to < 16.106.26020821affected

Microsoft Microsoft Office LTSC for Mac 2024

  • 16.0.0 to < 16.106.26020821affected

Microsoft Microsoft SharePoint Enterprise Server 2016

  • 16.0.0 to < 16.0.5539.1002affected

Microsoft Microsoft SharePoint Server 2019

  • 16.0.0 to < 16.0.10417.20097affected

Microsoft Microsoft SharePoint Server Subscription Edition

  • 16.0.0 to < 16.0.19127.20518affected

Microsoft Microsoft Word 2016

  • 16.0.1 to < 16.0.5539.1002affected

References