Auth bypass in Microsoft .Net
CVE-2026-45490
Improper authorization in .NET allows an authorized attacker to elevate privileges locally.
EPSS: 0.004 (31.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft .Net
- Microsoft .Net 10.0 — versions 10.0.0
- Microsoft .Net 8.0 — versions 8.0.0
- Microsoft .Net 9.0 — versions 9.0.0
- Microsoft Windows
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-45490?
- CVE-2026-45490 is a high-severity vulnerability in Microsoft .Net, classified under Improper Authorization. CVSS score: 7.8/10. Published 2026-06-09.
- How severe is CVE-2026-45490?
- High severity. CVSS v3 base score is 7.8 out of 10.