CVE-2026-26109
Out-of-Bounds Read in Excel Enables Local Code Execution
Publication date: 2026-03-10
Last updated on: 2026-03-13
Assigner: Microsoft Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | 365_apps | * |
| microsoft | 365_apps | * |
| microsoft | excel | 2016 |
| microsoft | excel | 2016 |
| microsoft | office_long_term_servicing_channel | 2021 |
| microsoft | office | 2019 |
| microsoft | office | 2019 |
| microsoft | office_long_term_servicing_channel | 2024 |
| 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_online_server | to 16.0.10417.20102 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-125 | The product reads data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :
The vulnerability can lead to remote code execution, meaning an attacker could run malicious code on your device without your permission, potentially compromising confidentiality, integrity, and availability of your data.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
Can you explain this vulnerability to me?
This vulnerability is an out-of-bounds read in Microsoft Office Excel that allows an unauthorized attacker to execute code locally on the affected system.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft for Microsoft Office Excel as soon as they become available.
Additionally, restricting local access to vulnerable systems and avoiding opening untrusted Excel files can reduce the risk of exploitation.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know