CVE-2026-26183
Improper Access Control in Windows RPC API Enables Local Privilege Escalation
Publication date: 2026-04-14
Last updated on: 2026-04-23
Assigner: Microsoft Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2012 | r2 |
| microsoft | windows_server_2012 | * |
| microsoft | windows_server_2016 | to 10.0.14393.9060 (exc) |
| microsoft | windows_server_2019 | to 10.0.17763.8644 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.5020 (exc) |
| microsoft | windows_server_2022_23h2 | to 10.0.25398.2274 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.32690 (exc) |
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 caused by improper access control in the Windows RPC API. It allows an authorized attacker to elevate their privileges locally on the affected system.
How can this vulnerability impact me? :
An attacker who already has some level of authorization on the system can exploit this vulnerability to gain higher privileges. This can lead to full control over the system, allowing the attacker to compromise confidentiality, integrity, and availability of data and resources.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability allows an authorized attacker to elevate privileges locally due to improper access control in the Windows RPC API.
Such elevation of privilege vulnerabilities can potentially lead to unauthorized access to sensitive data or systems, which may impact compliance with standards and regulations like GDPR and HIPAA that require strict access controls and protection of sensitive information.
However, no specific information about direct effects on compliance with these standards is provided in the available resources.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, apply the security updates provided by Microsoft as soon as possible to fix the improper access control in the Windows RPC API.
Ensure that only authorized users have local access to systems, as the vulnerability requires local privilege escalation.