What’s Vulnerable › Vulnerabilities

CVE-2026-45490: .NET SDK Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-09-24
• Weakness: CWE-285

Description

Improper authorization in .NET allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft .NET: from 8.0.0 before 8.0.28; from 9.0.0 before 9.0.17; from 10.0.0 before 10.0.9 — fixed in 10.0.9, 8.0.28, 9.0.17
• Microsoft .NET: from 10.0.0 before 10.0.9 — fixed in 10.0.9
• Microsoft .NET 8.0: from 8.0.0 before 8.0.28 — fixed in 8.0.28
• Microsoft .NET 9.0: from 9.0.0 before 9.0.17 — fixed in 9.0.17

How to fix

Upgrade to a fixed version: Microsoft .NET 10.0.9, 8.0.28, 9.0.17; Microsoft .NET 10.0.9; Microsoft .NET 8.0 8.0.28; Microsoft .NET 9.0 9.0.17. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45490
• https://access.redhat.com/security/cve/CVE-2026-45490
• https://bugzilla.redhat.com/show_bug.cgi?id=2487184
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45490.json

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