ASP.NET Core Elevation of Privilege Vulnerability
Priority MEDIUM 60CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Microsoft. Impact type from Microsoft.
Summary
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.11205 95th percentileScored 2026-11-07
Fix Fixed Microsoft.AspNetCore.DataProtection (NuGet): 10.0.7Microsoft: 1 update
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | ASP.NET Core 10.0 | 10.0 to before 10.0.7 | 10.0.7 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2026 version 18.5 | 18.5.0 to before 18.5.2 | 18.5.2 | Patch available | CNA |
| — | Microsoft.AspNetCore.DataProtection (NuGet) | 10.0.0 to before 10.0.7 | 10.0.7 | Patch available | GHSA-9mv3-2cwr-p262 |
- ASP.NET Core 10.0 VendorMicrosoft Affected 10.0 to before 10.0.7 Fixed in 10.0.7 Patch available CNA
- Microsoft Visual Studio 2026 version 18.5 VendorMicrosoft Affected 18.5.0 to before 18.5.2 Fixed in 18.5.2 Patch available CNA
- Microsoft.AspNetCore.DataProtection (NuGet) Vendor— Affected 10.0.0 to before 10.0.7 Fixed in 10.0.7 Patch available GHSA-9mv3-2cwr-p262
Remediation
- Fix · GHSA-9mv3-2cwr-p262 Microsoft.AspNetCore.DataProtection (NuGet) Fixed in 10.0.7 Advisory →
Microsoft 1 update
- Security Update
- ASP.NET Core 10.0 10.0.7
Vendor assessments
Red Hat
Red Hat rating: Critical. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
Microsoft
Microsoft's page for this CVE →
- Impact
- Elevation of Privilege
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
| Product | Status | Plan or fix |
|---|---|---|
| Microsoft Visual Studio 2026 version 18.5 | Fixed | 18.5.2 · Security Update |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40372
- 2026-10-03 Alias added: GHSA-9mv3-2cwr-p262
- 2026-10-25 EPSS moved to the 95th–99th percentile
References
More Microsoft Asp.net Core vulnerabilities
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2023-19596 .NET and Visual Studio Denial of Service Vulnerability KEVCVSS 3.1HIGH 7.5
- TI-2025-34970 ASP.NET Security Feature Bypass Vulnerability CVSS 3.1CRITICAL 9.9
- TI-2024-14164 .NET Denial of Service Vulnerability CVSS 3.1HIGH 7.5
- TI-2023-18092 ASP.NET Core Denial of Service Vulnerability CVSS 3.1HIGH 8.2
- TI-2023-18392 ASP.NET Core Security Feature Bypass Vulnerability CVSS 3.1MEDIUM 6.2
Sources
- CVE-2026-40372 · CVE Program
- CVE-2026-40372 · NVD
- FIRST EPSS
- GHSA-9mv3-2cwr-p262 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-40372 · Microsoft Security Update Guide
- CVE-2026-40372 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences