7.8

CVE-2026-26131: microsoft .net Incorrect Default Permissions

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-26131CGA-ppq3-53m5-6cr3CGA-qjpj-4837-46mw
Published 10-03-2026Last modified 19-06-2026
Open JSON

Vulnerability summary

CVE-2026-26131 is a high (CVSS 7.8) Incorrect Default Permissions vulnerability in microsoft .net. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · -0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 1 · Downstream 1
GHSA-387C-QMRW-59QVRHSA-2026:9077

Timeline

  1. 10-03-2026
    PublishedVulnerability first disclosed.
  2. 19-06-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

-0.05 pp

From 0.36% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

NuGet6 products
  • Microsoft.NETCore.App.Runtime.linux-arm≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-arm64≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-musl-arm≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-musl-arm64≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-musl-x64≥ 10.0.0, < 10.0.4
Microsoft2 products
Chainguard1 product
  • dotnet-bootstrap-10All versions (No fix recorded)
Ubuntu1 product
  • dotnet7All versions (No fix recorded)
Wolfi1 product
  • dotnet-bootstrap-10All versions (No fix recorded)

5 vendors · 11 products

References

9 links