CVE-2026-88091
HIGHDescription
Deserialization of untrusted data in Windows Management Instrumentation allows an authorized attacker to elevate privileges locally.
Is your site exposed to CVE-2026-88091?
Run a free security scan — no signup, results in seconds.
CVSS v3.1 Score
EPSS — Exploit Prediction
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
Weakness Type (CWE)
Affected Products
| Vendor | Product |
|---|---|
| microsoft | windows_10_1607 |
| microsoft | windows_10_1607 |
| microsoft | windows_10_1809 |
| microsoft | windows_10_1809 |
| microsoft | windows_10_21h2 |
| microsoft | windows_10_21h2 |
| microsoft | windows_10_21h2 |
| microsoft | windows_10_22h2 |
| microsoft | windows_10_22h2 |
| microsoft | windows_10_22h2 |
| microsoft | windows_11_23h2 |
| microsoft | windows_11_23h2 |
| microsoft | windows_11_24h2 |
| microsoft | windows_11_24h2 |
| microsoft | windows_11_25h2 |
| microsoft | windows_11_25h2 |
| microsoft | windows_11_26h1 |
| microsoft | windows_11_26h1 |
| microsoft | windows_11_26h2 |
| microsoft | windows_11_26h2 |
| microsoft | windows_server_2012 |
| microsoft | windows_server_2012 |
| microsoft | windows_server_2016 |
| microsoft | windows_server_2019 |
| microsoft | windows_server_2022 |
| microsoft | windows_server_2025 |
References
Advisories & Patches
Frequently Asked Questions
What is CVE-2026-88091? +
How severe is CVE-2026-88091? +
What products are affected by CVE-2026-88091? +
How do I check if I'm vulnerable to CVE-2026-88091? +
Related Vulnerabilities
An authenticated user with the nx-licensing-create privilege can upload a specially crafted license file to execute arbitrary operating system commands …
In affected versions of Octopus Server, an authenticated user with permissions to edit an Environment or Project can set specifically …
SEPPmail Secure Email Gateway before version 15.0.4 insecurely deserializes untrusted data, which can be reached from the new GINA UI …
Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service due to insecure deserialization in …
RELATE is a web-based courseware package. Prior to commit d66ba5659b459bf1ba56b7109b5f9ecf197cbefb, RELATE LMS configures its Celery workers to accept and deserialize …
A security vulnerability has been identified in the IBL Software Engineering Visual Weather and derived products (NAMIS, Aero Weather, Satellite …