Review reviewHigh
CVE-2026-45490
Microsoft .NET 10.0, .NET 8.0, .NET 9.0
Improper authorization in .NET allows an authorized attacker to elevate privileges locally.
- CVSS
- 7.8
- EPSS
- 0.38% 31.1% percentile
- CISA KEV
- Not listed
- Published
- 2026.06.10
Review review
The CVSS severity warrants an early asset and exposure review.
Known exploitationNot established by KEV
Exploit probability0.38%
Technical severityCVSS 7.8
Vulnerability overview
Improper authorization in .NET allows an authorized attacker to elevate privileges locally.
Affected product and versions
- Product
- Microsoft .NET 10.0, .NET 8.0, .NET 9.0
- Affected versions
- >= 10.0.0 < 10.0.9, >= 8.0.0 < 8.0.28, >= 9.0.0 < 9.0.17
- Fixed versions
- 8.0.28, 9.0.17, 10.0.9
Recommended response sequence
Confirm exposure before applying a vendor-supported change.
- 1Identify
Confirm that Microsoft .NET 10.0, .NET 8.0, .NET 9.0 and an affected version are present.
- 2Prioritize
Combine exploitation signals with asset exposure and business criticality.
- 3Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
- 4Verify
Recheck the version, service health, access paths, and relevant logs.
Technical data
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-266, CWE-285, CWE-863