CVE-2026-83891
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Microsoft Office Word Stack-Based Buffer Overflow
Vulnerability report for CVE-2026-83891, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-13
Assigner: Microsoft Corporation
Description
Description
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | Microsoft | 365 Apps for Enterprise 16.0.1 |
| Microsoft | Microsoft | Office 365 for Mac 1.0.0 |
| Microsoft | Microsoft | Office LTSC 2021 16.0.1 |
| Microsoft | Microsoft | Office LTSC 2024 16.0.0 |
| Microsoft | Microsoft | Office LTSC for Mac 2021 16.0.1 |
| Microsoft | Microsoft | Office LTSC for Mac 2024 16.0.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-20 | The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. |
| CWE-121 | A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). |
