CVE-2026-26131
published 2026-03-10CVE-2026-26131: Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
PriorityP344high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.36%
28.3th percentile
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft.netcore.app.runtime.linux-arm | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | microsoft.netcore.app.runtime.linux-arm64 | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-arm64 | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | microsoft.netcore.app.runtime.linux-musl-x64 | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | microsoft.netcore.app.runtime.linux-x64 | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | net | >= 10.0.0 < 10.0.4 | 10.0.4 |
| microsoft | net_10.0 | >= 10.0.0 < 10.0.4 | 10.0.4 |
| msrc | net_10.0_installed_on_linux | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
ghsa7.8HIGH
osv7.8HIGH
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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Microsoft
.NET Elevation of Privilege Vulnerability
vendor_msrc·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] CWE-276 .NET Elevation of Privilege Vulnerability
.NET Elevation of Privilege Vulnerability
Description: Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
FAQ: What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain the highest privileges on the system.
.NET: .NET
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Reference: https://dotnet.microsoft.com/download/dotnet/10.0
Reference: https://support.microsoft.com/help/5081276
Red Hat
dotnet: .NET: Privilege escalation via incorrect default permissions
vendor_redhat·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] CWE-276 dotnet: .NET: Privilege escalation via incorrect default permissions
dotnet: .NET: Privilege escalation via incorrect default permissions
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
A flaw was found in .NET. Incorrect default permissions allow an authorized local attacker to exploit this vulnerability. This can lead to local privilege escalation, enabling the attacker to gain higher access rights on the system.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Package: dotnet10.0 (Red Hat Enterprise Linux 10) - Affected
Package: dotnet8.0 (Red Hat Enterprise Linux 10) - Not affected
Package: dotnet9.0 (R
OSV
.NET Elevation of Privilege Vulnerability
osv·2026-03-11·CVSS 7.8
CVE-2026-26131 [HIGH] .NET Elevation of Privilege Vulnerability
.NET Elevation of Privilege Vulnerability
# Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An elevation of privilege vulnerability exists in .NET due to improper authorization. Incorrect packaging permissions could allow an attacker to gain elevated privileges.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/386
## CVSS Details
- **Severity:** High
- **Version:** 3.1
- **Score:** 7.8
- **Vector:** `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:
GHSA
.NET Elevation of Privilege Vulnerability
ghsa·2026-03-11·CVSS 7.8
CVE-2026-26131 [HIGH] CWE-276 .NET Elevation of Privilege Vulnerability
.NET Elevation of Privilege Vulnerability
# Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 10.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An elevation of privilege vulnerability exists in .NET due to improper authorization. Incorrect packaging permissions could allow an attacker to gain elevated privileges.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/386
## CVSS Details
- **Severity:** High
- **Version:** 3.1
- **Score:** 7.8
- **Vector:** `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:
OSV
CVE-2026-26131: Incorrect default permissions in
osv·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] CVE-2026-26131: Incorrect default permissions in
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
OSV
Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
osv·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
### 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.
GHSA
Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
ghsa·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] CWE-276 Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
Duplicate Advisory: Microsoft Security Advisory CVE-2026-26131 – .NET Elevation of Privilege Vulnerability
### 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.
No detection rules found.
No public exploits indexed.
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos·2026-03-13
March Patch Tuesday visits 15 product families
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Tenable
March 2026 Microsoft Patch Tuesday | Tenable®
blogs_tenable·2026-03-10·CVSS 8.8
CVE-2026-21262 [HIGH] March 2026 Microsoft Patch Tuesday | Tenable®
Blog / Cyber Exposure Alerts
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# Microsoft’s March 2026 Patch Tuesday Addresses 83 CVEs (CVE-2026-21262, CVE-2026-26127)
Research Special Operations
March 10, 2026
4 Min Read
1. 8Critical
2. 75Important
3. 0Moderate
4. 0Low
Microsoft addresses 83 CVEs including two vulnerabilities that were publicly disclosed prior to a patch being released.
Microsoft patched 83 CVEs in its March 2026 Patch Tuesday release, with eight rated critical and 75 rated as important. Our counts omitted one CVE (CVE-2026-26030) assigned by GitHub.
This month’s update includes patches for:
- .NET
- ASP.NET Core
- Active Directory Domain Services
- Azure Arc
- Azure Compute Gallery
- Azure Entra ID
- Azure IoT Explorer
- Azure Linux Virtual Machines
- Azure MCP Server
- Azure Portal Windows Admin Cen
Tenable
March 2026 Microsoft Patch Tuesday | Tenable®
blogs_tenable·2026-03-10
March 2026 Microsoft Patch Tuesday | Tenable®
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
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Tenable Patch Management Request a demo
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Tenable AI Exposure Request a demo
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Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Bleepingcomputer
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
blogs_bleepingcomputer·2026-03-10·CVSS 8.8
[HIGH] Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Lawrence Abrams
The number of bugs in each vulnerability category is listed below:
46 Elevation of Privilege Vulnerabilities
2 Security Feature Bypass Vulnerabilities
18 Remote Code Execution Vulnerabilities
10 Information Disclosure Vulnerabilities
4 Denial of Service Vulnerabilities
4 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 9 Microsoft Edge flaws, Mariner, Payment Orchestrator Service, Azure, and Microsoft Devices Pricing Program flaws fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos
March Patch Tuesday visits 15 product families
Share This
Microsoft on Tuesday released 84 patches affecting 15 product families – including a few you’ve possibly never encountered. Eight of the addressed issues are considered by Microsoft to be of Critical severity, though none of those affect Windows, nor are they expected to be exploited within the next 30 days. In addition, five of those Critical issues were in fact addressed by Microsoft in advance of Patch Tuesday itself, as we’ll discuss below. Twenty-two have a CVSS base score of 8.0 or higher, including one with a 9.8 base score. None are known to be under active exploit in the wild, but two are publicly disclosed so far.
At patch time, six CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation. Various of this month’s issues are amenable
Wiz
CVE-2026-26131 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.8
CVE-2026-26131 [HIGH] CVE-2026-26131 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-26131 :
C# vulnerability analysis and mitigation
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
Source : NVD
## 7.8
Score
Published March 10, 2026
Severity HIGH
CNA Score 7.8
Affected Technologies
C#
.NET SDK
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 3.5
Exploitation Probability (EPSS) N/A
Affected packages and libraries
dotnet-runtime-10.0
dotnet-runtime-dbg-10.0
Sources
Alpine 3.23 Severity HIGH Has Fix Added at: Mar 13, 2026
Alpine edge Severity HIGH Has Fix Added at: Mar 14, 2026
NuGet Severity HIGH Has Fix Added at: Mar 12, 2026
Red Hat 8, 9, 10 Severity MEDIUM No Fix Added at: Mar 12, 2026
Linux Seve
Bugzilla
CVE-2026-26131 dotnet: .NET: Privilege escalation via incorrect default permissions
bugzilla·2026-03-10·CVSS 7.8
CVE-2026-26131 [HIGH] CVE-2026-26131 dotnet: .NET: Privilege escalation via incorrect default permissions
CVE-2026-26131 dotnet: .NET: Privilege escalation via incorrect default permissions
Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
2026-03-10
Published