Vulnerability · Published Jun 9, 2026 · Assigned by microsoft
CVE-2026-45490.NET SDK Elevation of Privilege Vulnerability
High 7.8
In plain English
A high-severity security flaw in .NET 10.0 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 67.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper authorization in .NET allows an authorized attacker to elevate privileges locally.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dotnet10-runtime | 10.0.9-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.24 | dotnet10-runtime | 10.0.9-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.22 | dotnet8-runtime | 8.0.28-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.23 | dotnet8-runtime | 8.0.28-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.24 | dotnet8-runtime | 8.0.28-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.21 | dotnet9-runtime | 9.0.17-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.22 | dotnet9-runtime | 9.0.17-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.23 | dotnet9-runtime | 9.0.17-r0 | ALPINE-CVE-2026-45490 |
| Alpine:v3.24 | dotnet9-runtime | 9.0.17-r0 | ALPINE-CVE-2026-45490 |
| Ubuntu:22.04:LTS | dotnet7 | no fix listed | UBUNTU-CVE-2026-45490 |
Affected products (as reported)
Weakness: CWE-285, CWE-266 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- .NET SDK Elevation of Privilege Vulnerability vendor-advisory, patch
- https://access.redhat.com/security/cve/CVE-2026-45490 vdb-entry, x_refsource_REDHAT
- RHBZ#2487184 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45490.json x_sadp-csaf-vex