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

Microsoft Excel Information Disclosure Vulnerability

CVE-2026-21261

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Affected products

9
  • Microsoft/Office Excelllm-fuzzy
  • Microsoft/Microsoft 365 Apps for Enterprisev5
    Range: 16.0.1
  • Microsoft/Microsoft Excel 2016v5
    Range: 16.0.0.0
  • Microsoft/Microsoft Office 2019v5
    Range: 19.0.0
  • Microsoft/Microsoft Office LTSC 2021v5
    Range: 16.0.1
  • Microsoft/Microsoft Office LTSC 2024v5
    Range: 16.0.0
  • Microsoft/Microsoft Office LTSC for Mac 2021v5
    Range: 16.0.1
  • Microsoft/Microsoft Office LTSC for Mac 2024v5
    Range: 16.0.0
  • Microsoft/Office Online Serverv5
    Range: 16.0.0.0

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

News mentions

0

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