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7.8
Microsoft Office Excel can allow unauthorized code execution
CVE-2026-26109
Summary
An attacker can potentially take control of a computer by manipulating Microsoft Office Excel files. This can happen if a user opens a malicious file, allowing the attacker to execute code without permission. Users and administrators should update to the latest version of Microsoft Office Excel to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| microsoft | 365_apps | All versions | – |
| microsoft | 365_apps | All versions | – |
| microsoft | excel | 2016 | – |
| microsoft | excel | 2016 | – |
| microsoft | office | 2019 | – |
| microsoft | office | 2019 | – |
| microsoft | office_long_term_servicing_channel | 2021 | – |
| microsoft | office_long_term_servicing_channel | 2021 | – |
| microsoft | office_long_term_servicing_channel | 2021 | – |
| microsoft | office_long_term_servicing_channel | 2024 | – |
| microsoft | office_long_term_servicing_channel | 2024 | – |
| microsoft | office_long_term_servicing_channel | 2024 | – |
| microsoft | office_online_server | <= 16.0.10417.20102 | – |
Original title
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Original description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
nvd CVSS3.1
8.4
Vulnerability type
CWE-125
Out-of-bounds Read
Published: 10 Mar 2026 · Updated: 14 Mar 2026 · First seen: 11 Mar 2026