CRITICAL 9.1 Microsoft
CVE-2026-40372
ASP.NET Core Elevation of Privilege Vulnerability
Microsoft Security Update 2026-Apr: ASP.NET Core Elevation of Privilege Vulnerability
Affected Products
- ASP.NET Core 10.0
- Microsoft Visual Studio 2026 version 18.5
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372
- https://nvd.nist.gov/vuln/detail/CVE-2026-40372
This critical severity vulnerability with a CVSS score of 9.1 was published on 2026-04-14 via Microsoft. EPSS score: 11.2% (top 4% of all CVEs by exploitation probability). Affected: ASP.NET Core 10.0, Microsoft Visual Studio 2026 version 18.5.
Risk Timeline
CVE Disclosed2026-04-14 · 157 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-40372Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2025-55315 PoC | ASP.NET Security Feature Bypass Vulnerability | CRITICAL | 9.9 |
| CVE-2026-69304 | ASP.NET Core Denial of Service Vulnerability | MEDIUM | 5.9 |
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