CVE-2026-105544
.NET Elevation of Privilege Vulnerability
Improper access control in .NET allows an authorized attacker to elevate privileges locally.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: microsoftAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| .NET 10.0 installed on Linux Microsoft |
≥ 10.0.0; < 10.0.404 (affected, custom) | CNA: microsoft |
| .NET 10.0 installed on Mac OS Microsoft |
≥ 10.0.0; < 10.0.404 (affected, custom) | CNA: microsoft |
| .NET 10.0 installed on Windows Microsoft |
≥ 10.0.0; < 10.0.404 (affected, custom) | CNA: microsoft |
| .NET 11.0 installed on Linux Microsoft |
≥ 11.0.0-preview.1; < 11.0.100 (affected, custom) | CNA: microsoft |
| .NET 11.0 installed on Mac OS Microsoft |
≥ 11.0.0-preview.1; < 11.0.100 (affected, custom) | CNA: microsoft |
| .NET 11.0 installed on Windows Microsoft |
≥ 11.0.0-preview.1; < 11.0.100 (affected, custom) | CNA: microsoft |
| .NET 8.0 installed on Linux Microsoft |
≥ 8.0.0; < 8.0.428 (affected, custom) | CNA: microsoft |
| .NET 8.0 installed on Mac OS Microsoft |
≥ 8.0.0; < 8.0.428 (affected, custom) | CNA: microsoft |
| .NET 8.0 installed on Windows Microsoft |
≥ 8.0.0; < 8.0.428 (affected, custom) | CNA: microsoft |
| .NET 9.0 installed on Linux Microsoft |
≥ 9.0.0; < 9.0.321 (affected, custom) | CNA: microsoft |
| .NET 9.0 installed on Mac OS Microsoft |
≥ 9.0.0; < 9.0.321 (affected, custom) | CNA: microsoft |
| .NET 9.0 installed on Windows Microsoft |
≥ 9.0.0; < 9.0.321 (affected, custom) | CNA: microsoft |
| Microsoft Visual Studio 2022 version 17.14 Microsoft |
≥ 17.14.0; < 17.14.45 (affected, custom) | CNA: microsoft |
| Microsoft Visual Studio 2026 version 18.11 Microsoft |
≥ 18.11.0; < 18.11.4 (affected, custom) | CNA: microsoft |
| Microsoft Visual Studio 2026 version 18.12 Microsoft |
≥ 18.12.0; < 18.12.0 (affected, custom) | CNA: microsoft |
| Microsoft.TestPlatform.CLI Microsoft |
≥ 17.2.0; < 18.11.1 (affected, custom) | CNA: microsoft |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C | CNA: microsoft |
| 3.1 / 7.5 high |
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105544CNA: microsoft · vendor-advisory, patch
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105544[email protected]
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.