CVE-2026-47303: Microsoft .net

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

Affected products

• Microsoft .net: from 8.0.0, before 8.0.29 (fixed in 8.0.29); from 9.0.0, before 9.0.18 (fixed in 9.0.18); from 10.0.0, before 10.0.6 (fixed in 10.0.6)
• Microsoft Visual Studio 2022: from 17.12.0, before 17.12.22 (fixed in 17.12.22); from 17.14.0, before 17.14.36 (fixed in 17.14.36)
• Microsoft Visual Studio 2026: from 18.7.0, before 18.7.4 (fixed in 18.7.4)

Published 2026-07-14. Last modified 2026-07-22.