CVE-2026-26131

HIGHPre-NVD 7.87.8
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:microsoft
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

CVSS v3
7.8
EG Score
7.8(low)
EPSS
28.0%
KEV
Not listed

Published

March 10, 2026

Last Modified

June 19, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26131

Vendor Advisories for CVE-2026-26131(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatdotnet10-0-main-10.0.106-1.hum12026-04-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 1 ecosystem)
NuGet(6)
PackageVulnerable rangeFixed inDependents
Microsoft.NetCore.App.Runtime.linux-arm10.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—
Microsoft.NetCore.App.Runtime.linux-arm6410.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—
Microsoft.NetCore.App.Runtime.linux-musl-arm10.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—
Microsoft.NetCore.App.Runtime.linux-musl-arm6410.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—
Microsoft.NetCore.App.Runtime.linux-musl-x6410.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—
Microsoft.NetCore.App.Runtime.linux-x6410.0.0, 10.0.1, 10.0.2, 10.0.310.0.4—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-01 15:06 UTCEPSS rescore
  14. 2026-07-01 15:06 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 14:05 UTCEPSS rescore
  25. 2026-06-24 14:05 UTCEPSS rescore
Show 5 more
  1. 2026-06-23 21:33 UTCEPSS rescore
  2. 2026-06-23 21:32 UTCEPSS rescore
  3. 2026-06-22 23:46 UTCEG score recompute
  4. 2026-06-22 23:46 UTCVendor advisory
  5. 2026-06-22 23:45 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-26131?
CVE-2026-26131 is a high vulnerability published on March 10, 2026. Incorrect default permissions in .NET allows an authorized attacker to elevate privileges locally.
When was CVE-2026-26131 disclosed?
CVE-2026-26131 was first published in the National Vulnerability Database on March 10, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26131 actively exploited?
CVE-2026-26131 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-26131?
CVE-2026-26131 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-26131?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26131, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-26131

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