CVE-2026-83899
Analyzed
Analyzed - Analysis Complete
Improper Privilege Management in Windows Installer
Vulnerability report for CVE-2026-83899, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-13
Last updated on: 2026-10-21
Assigner: Microsoft Corporation
Description
Description
Improper privilege management in Windows Installer allows an authorized attacker to elevate privileges locally.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2012 | r2 |
| microsoft | windows_server_2012 | * |
| microsoft | windows_server_2022 | to 10.0.20348.5761 (exc) |
| microsoft | windows_10_1607 | to 10.0.14393.9612 (exc) |
| microsoft | windows_10_1607 | to 10.0.14393.9612 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.9376 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.9376 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7807 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7807 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7807 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7652 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7652 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.9711 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.9711 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.9711 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.9711 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.3231 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.3231 (exc) |
| microsoft | windows_11_26h2 | to 10.0.26300.9711 (exc) |
| microsoft | windows_11_26h2 | to 10.0.26300.9711 (exc) |
| microsoft | windows_server_2016 | to 10.0.14393.9612 (exc) |
| microsoft | windows_server_2019 | to 10.0.17763.9376 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.33650 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7807 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7807 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7807 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-362 | The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. |
