Home/CVE/Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
CVE

CVE-2026-26131

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

HIGH · CVSS 7.8 EPSS 0.00025
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules5 YARA rules0
⬡

Weakness Classification

CWE-276Incorrect Default Permissions
▤

Affected Products & Versions

1
microsoft .net>= 10.0.0 and < 10.0.4
▤

Affected Packages

6
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
NuGet Microsoft.NetCore.App.Runtime.linux-arm HIGH fixed in 10.0.4
NuGet Microsoft.NetCore.App.Runtime.linux-arm64 HIGH fixed in 10.0.4
NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm HIGH fixed in 10.0.4
NuGet Microsoft.NetCore.App.Runtime.linux-musl-arm64 HIGH fixed in 10.0.4
NuGet Microsoft.NetCore.App.Runtime.linux-musl-x64 HIGH fixed in 10.0.4
NuGet Microsoft.NetCore.App.Runtime.linux-x64 HIGH fixed in 10.0.4
◈

Sigma Hunt Rules

5
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighUAC Bypass Using .NET Code Profiler on MMC
producthighPotential AMSI Bypass Via .NET Reflection
producthighETW Logging Tamper In .NET Processes Via CommandLine
producthighETW Logging Disabled In .NET Processes - Registry
producthighETW Logging Disabled In .NET Processes - Sysmon Registry
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Scoring & Timeline

7.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Mar 2026 · 06:18 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
rhsaRHSA-2026:9077Important
msrcCVE-2026-26131Elevation of Privilege
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