Improper Authorization in .NET and Microsoft .NET Framework - CVE-2026-45490

Vulnerability identifier: #VU134116

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-45490

CWE-ID: CWE-285

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists due to insufficient authorization controls in NET SDK. A local user can gain elevated privileges on the target system.

.NET
Microsoft .NET Framework
Fedora
dotnet8.0
dotnet9.0
dotnet10.0

Install updates from vendor's website.

.NET - addressed in versions 8.0.28, 9.0.17
Microsoft .NET Framework - update to 10.0.9
dotnet8.0 - addressed in versions 8.0.128-1.fc43, 8.0.128-1.fc44
dotnet9.0 - addressed in versions 9.0.118-1.fc43, 9.0.118-1.fc44
dotnet10.0 - update to 10.0.109-1.fc43

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45490

• Privilege escalation in Microsoft .NET SDK
• Fedora 43 update for dotnet10.0
• Fedora 43 update for dotnet9.0
• Fedora 44 update for dotnet9.0
• Fedora 43 update for dotnet8.0
• Fedora 44 update for dotnet8.0