MicrosoftCVE-2026-47303

Microsoft ASP.NET Core: authentication bypass

High8.8CVE-2026-47303 · Published Jul 14, 2026 · updated Jul 22, 2026

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

Microsoft advisory

Affected versions

Package	Affected	Fixed in
.NET 10.0 Product	>= 10.0.0, < 10.0.10	10.0.10
.NET 8.0 Product	>= 8.0.0, < 8.0.29	8.0.29
.NET 9.0 Product	>= 9.0.0, < 9.0.18	9.0.18
Microsoft Visual Studio 2022 version 17.12 Product	>= 17.12.0, < 17.12.22	17.12.22
Microsoft Visual Studio 2022 version 17.14 Product	>= 17.14.0, < 17.14.36	17.14.36
Microsoft Visual Studio 2026 version 18.7 Product	>= 18.0, < 18.7.4	18.7.4

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-90, CWE-302, CWE-863

More Microsoft advisories

Date	Advisory	Severity	Fixed in
Jul 14	Secret exfiltration vulnerability HighJul 14 CVE-2026-472821.128.1	High	1.128.1
Jul 14	Workspace Trust Security Feature Bypass Vulnerability HighJul 14 CVE-2026-571011.128.1	High	1.128.1
Jul 14	Remote Code Execution Vulnerability HighJul 14 CVE-2026-571021.128.1	High	1.128.1
Jul 14	Microsoft .NET 8.0: unsafe deserialization High7.8Jul 14 CVE-2026-506498.0.29+9 more	High7.8	8.0.29+9 more
Jul 14	Microsoft .NET 8.0: code injection High7.8Jul 14 CVE-2026-506508.0.29+10 more	High7.8	8.0.29+10 more
Jul 14	Microsoft .NET 10.0: resource exhaustion High7.5Jul 14 CVE-2026-5065110.0.10+5 more	High7.5	10.0.10+5 more

Critical advisories by email

Wednesdays: the week’s critical and high advisories in the AI and data stack, with the fixed versions. Only in weeks that have some.