GHSA-387c-qmrw-59qv
Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
High
Withdrawn Mar 11, 2026
NuGet
- Severity
- 7.8 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- —
- No score published
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-276 Incorrect Default Permissions
- Fix
- Available
- 6 packages have a fixed version
Description
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-crjq-wm6x-6qx7. This link is maintained to preserve external references.
Original Description
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
Affected versions
NuGet
| Package | Vulnerable | Fixed in |
|---|---|---|
| Microsoft.NetCore.App.Runtime.linux-arm | >= 10.0.0, < 10.0.4 |
10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-arm64 | >= 10.0.0, < 10.0.4 |
10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 10.0.0, < 10.0.4 |
10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 10.0.0, < 10.0.4 |
10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 10.0.0, < 10.0.4 |
10.0.4 |
| Microsoft.NetCore.App.Runtime.linux-x64 | >= 10.0.0, < 10.0.4 |
10.0.4 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
Microsoft.NetCore.App.Runtime.linux-arm NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-arm --version 10.0.4
Microsoft.NetCore.App.Runtime.linux-arm64 NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-arm64 --version 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm --version 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-arm64 NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-arm64 --version 10.0.4
Microsoft.NetCore.App.Runtime.linux-musl-x64 NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-musl-x64 --version 10.0.4
Microsoft.NetCore.App.Runtime.linux-x64 NuGet → 10.0.4
- dotnet
dotnet add package Microsoft.NetCore.App.Runtime.linux-x64 --version 10.0.4
Severity breakdown
CVSS 3.1 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-276: Incorrect Default Permissions
During installation, installed file permissions are set to allow anyone to modify those files.
How to prevent it
- Architecture and Design, Operation: The architecture needs to access and modification attributes for files to only those users who actually require those actions.
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References
Advisories
Packages
Other links
Timeline
- Published
- Withdrawn
- Last updated by the source
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| CVE-2020-1147 .NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability | High Known exploited | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-87vj-4hqv-22p9 Microsoft Security Advisory CVE-2026-96233 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-2j93-m82w-73j2 Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-w6wh-p4g7-mpj2 Microsoft Security Advisory CVE-2026-96225 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-fqpq-cx42-9jmm Microsoft Security Advisory CVE-2026-70194 - .NET and Visual Studio Security Feature Bypass Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-3rxq-g8rj-r2cf Microsoft Security Advisory CVE-2026-69651 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-wxxw-5cvc-53j7 Microsoft Security Advisory CVE-2026-66822 - .NET and Visual Studio Information Disclosure Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-mc4q-93x5-f6hj Microsoft Security Advisory CVE-2026-58280 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
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