CVE-2026-26131 | .NET Elevation of Privilege Vulnerability

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

Published: 2026-03-10 Last update: 2026-04-01 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-26131 is rated Moderate Risk (41.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.36%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-26131

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.36% +0.32%
2 2026-03-11 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-26131

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]

Weakness enumeration for CVE-2026-26131

GitHub Security Advisory for CVE-2026-26131

GHSA-crjq-wm6x-6qx7 · Severity: high · Ecosystem: nuget — .NET Elevation of Privilege Vulnerability

OS Trackers for CVE-2026-26131

vendor priority summary link
alpine — CVE-2026-26131: 1 source package rows (dotnet10-runtime); 2 state rows across 2 repos (3.23-community, edge-community); fixed 2, open 0. https://security.alpinelinux.org/vuln/CVE-2026-26131
redhat medium — https://access.redhat.com/security/cve/CVE-2026-26131
ubuntu medium CVE-2026-26131 medium priority: Ubuntu including 5 source packages (dotnet10, dotnet6, dotnet7, dotnet8, dotnet9), 40 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): DNE 27, not-affected 7, needs-triage 5, ignored 1. https://ubuntu.com/security/CVE-2026-26131

Affected software / configurations for CVE-2026-26131

Vendor Product Version Raw CPE
microsoft .net >= 10.0.0, < 10.0.4 cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*

References for CVE-2026-26131

cvelogic Threat Intelligence