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

Microsoft Outlook Spoofing Vulnerability

CVE-2026-21260

Description

Exposure of sensitive information to an unauthorized actor in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

Affected products

Microsoft/Outlookllm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: 16.0.0.0
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/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

Patches

Vulnerability mechanics

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21260mitrevendor-advisorypatch

News mentions

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