CVE-2026-20949
Improper Access Control in Microsoft Excel Enables Local Bypass
Publication date: 2026-01-13
Last updated on: 2026-01-13
Assigner: Microsoft Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | office_excel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-284 | The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an improper access control issue in Microsoft Office Excel that allows an unauthorized attacker to locally bypass a security feature. [1]
How can this vulnerability impact me? :
An attacker exploiting this vulnerability can bypass security features in Microsoft Excel without proper authorization, potentially leading to high impact on confidentiality, integrity, and availability of data. [1]
What immediate steps should I take to mitigate this vulnerability?
Apply the security updates provided by Microsoft for Microsoft Office Excel to address the improper access control vulnerability and prevent unauthorized local security feature bypass. [1]