Unrated severityNVD Advisory· Published Feb 10, 2026· Updated Apr 10, 2026

Microsoft Outlook Spoofing Vulnerability

CVE-2026-21511

Description

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

Microsoft/Outlookllm-fuzzy
Microsoft/Microsoft 365 Apps for Enterprisev5
Range: 16.0.1
Microsoft/Office Visiocpe-rescue
Range: 19.0.0
Microsoft/Officecpe-rescue2 versions
16.0.1+ 1 more
- (no CPE)range: 16.0.1
- (no CPE)range: 16.0.0
Microsoft/Office For Maccpe-rescue2 versions
16.0.1+ 1 more
- (no CPE)range: 16.0.1
- (no CPE)range: 16.0.0
Microsoft/Sharepoint Servercpe-rescue2 versions
16.0.0+ 1 more
- (no CPE)range: 16.0.0
- (no CPE)range: 16.0.0
Microsoft/Office SharePointcpe-rescue
Range: 16.0.0
Microsoft/Wordcpe-rescue
Range: 16.0.1

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