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

Microsoft Excel Elevation of Privilege Vulnerability

CVE-2026-21259

Description

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to elevate privileges locally.

Affected products

7

Microsoft/Office Excelllm-fuzzy
Microsoft/Microsoft 365 Apps for Enterprisev5
Range: 16.0.1
Microsoft/Excel 2007 SP3cpe-rescue
Range: 16.0.0.0
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 Online Servercpe-rescue
Range: 16.0.0.0

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21259mitrevendor-advisorypatch

News mentions

0

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