.NET Information Disclosure Vulnerability
CVE-2026-58649

6.5MEDIUM

Key Information:

Vendor

Microsoft
Status
.net 10.0
.net 11.0
.net 8.0
.net 9.0
Vendor
CVE Published:
8 September 2026

What is CVE-2026-58649?

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

Affected Version(s)

.NET 10.0 10.0.0 < 10.0.111, 10.0.400

.NET 11.0 11.0.0 < 11.0 RC1

.NET 8.0 8.0.0 < 8.0.130, 8.0.424

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.