CVE-2026-21509
Unknown
Unknown - Not Provided
BaseFortify
Publication date: 2026-01-26
Last updated on: 2026-02-11
Assigner: Microsoft Corporation
Description
Description
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | 365_apps | * |
| microsoft | 365_apps | * |
| microsoft | office | 2016 |
| microsoft | office | 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 | 2024 |
| microsoft | office_long_term_servicing_channel | 2024 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-807 | The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves Microsoft Office relying on untrusted inputs when making a security decision, which allows an unauthorized attacker to locally bypass a security feature. [1]
How can this vulnerability impact me? :
An attacker could exploit this vulnerability to bypass security features in Microsoft Office on a local machine, potentially leading to unauthorized access or actions that compromise confidentiality, integrity, and availability. [1]
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