Elevation of Privilege Vulnerability in ASP.NET Core by Microsoft
CVE-2026-47300

8.8HIGH

Key Information:

Vendor

Microsoft
Status
.net 10.0
.net 8.0
.net 9.0
Microsoft Visual Studio 2022 Version 17.12
Vendor
CVE Published:
14 July 2026

What is CVE-2026-47300?

An elevation of privilege vulnerability exists in ASP.NET Core due to an improper implementation of the authentication algorithm. An attacker with network access could exploit this flaw to gain elevated access to resources and perform unauthorized actions. This underscores the importance of securing authentication processes to prevent potential exploitation.

Affected Version(s)

.NET 10.0 10.0.0 < 10.0.6

.NET 8.0 8.0.0 < 8.0.29

.NET 9.0 9.0.0 < 9.0.18

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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