What is the CVSS score of CVE-2026-26131?

CVE-2026-26131 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-26131?

Within 24 hours: Inventory all .NET deployments and identify systems running affected versions; restrict administrative access and review privileged account activities for suspicious behavior. Within 7 days: Implement enhanced monitoring of privilege escalation attempts and enforce principle of least privilege across .NET applications and services. Within 30 days: Establish a patch readiness plan with the vendor; prepare and test patches in non-production environments immediately upon release and deploy to production systems within 48 hours of validation.

Net CVE-2026-26131

HIGH

Incorrect Default Permissions (CWE-276)

2026-03-10 secure@microsoft.com

GHSA-crjq-wm6x-6qx7

Privilege Escalation Microsoft Red Hat Net

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Attacker gains local access
Exploit

Exploit incorrect default permissions
Execution

Escalate to higher privilege level
Impact

Access protected resources

Vulnerability Assessment

Weakness	CWE CWE-276 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Default permission hardening MITRE ATT&CK 1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Local user account required on .NET system with incorrect file/directory permissions in default configuration. Requires PR:L (low privilege local user) access to vulnerable .NET installation.
Impact	CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via local access.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally. [CVSS 7.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affected Packages

microsoft net_10_0_installed_on_linux_10_0_4 fix: .NET 10.0 installed on Linux 10.0.4

nuget microsoft.netcore.app.runtime.linux-arm fix: 10.0.4

nuget microsoft.netcore.app.runtime.linux-arm64 fix: 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-arm fix: 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-arm64 fix: 10.0.4

nuget microsoft.netcore.app.runtime.linux-musl-x64 fix: 10.0.4

nuget microsoft.netcore.app.runtime.linux-x64 fix: 10.0.4

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 7 packages in microsoft, nuget

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-276 (Incorrect Default Permissions). Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Red Hat 7.8 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 10, 2026 - 18:18 nvd

HIGH 7.8

DescriptionCVE.org

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

Executive ViewAI

Why It Matters

CVE-2026-26131 affects .NET environments and allows authorized users to escalate their privileges to higher system levels. This poses a significant risk to organizations running .NET applications, as internal threats or compromised accounts could gain administrative control, potentially leading to data breaches, system compromise, or operational disruption.

Business Impact: High

Compensating Controls

Enforce principle of least privilege for all user accounts; implement network segmentation to isolate critical .NET systems; deploy endpoint detection and response (EDR) tools to monitor for privilege escalation activities; restrict local administrative access; enable detailed audit logging of privilege changes; implement application whitelisting where feasible; conduct additional identity and access reviews focusing on .NET system accounts; monitor for CVE-2026-26131 exploitation indicators.

Threat Intelligence Overview

EPSS Score

0.0%

Top 87% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.