NVD

CVE-2026-47300 Detail

Description

Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: Microsoft Corporation

Base Score: 8.8 HIGH

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300	Microsoft Corporation	Patch Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-303	Incorrect Implementation of Authentication Algorithm	Microsoft Corporation

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

CVE Modified by Microsoft Corporation 7/22/2026 5:17:15 PM

Action

Type

Old Value

New Value

Changed

Affected

[{"vendor":"Microsoft","product":".NET 10.0","versions":[{"version":"10.0.0","lessThan":"10.0.6","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 8.0","versions":[{"version":"8.0.0","lessThan":"8.0.29","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 9.0","versions":[{"version":"9.0.0","lessThan":"9.0.18","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.12","versions":[{"version":"17.12.0","lessThan":"17.12.22","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.14","versions":[{"version":"17.14.0","lessThan":"17.14.36","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.7","versions":[{"version":"18.0","lessThan":"18.7.4","versionType":"custom","status":"affected"}]}]

[{"vendor":"Microsoft","product":".NET 10.0","versions":[{"version":"10.0.0","lessThan":"10.0.10","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 8.0","versions":[{"version":"8.0.0","lessThan":"8.0.29","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 9.0","versions":[{"version":"9.0.0","lessThan":"9.0.18","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.12","versions":[{"version":"17.12.0","lessThan":"17.12.22","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.14","versions":[{"version":"17.14.0","lessThan":"17.14.36","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.7","versions":[{"version":"18.0","lessThan":"18.7.4","versionType":"custom","status":"affected"}]}]

Initial Analysis by NIST 7/22/2026 1:33:12 PM

Action	Type	New Value
Added	CPE Configuration	AND OR cpe:2.3:a:microsoft:.net::::::::* versions from (including) 10.0.0 up to (excluding) 10.0.6 OR cpe:2.3:o:linux:linux_kernel:-:::::::* cpe:2.3:o:apple:macos:-:::::::*
Added	CPE Configuration	AND OR cpe:2.3:a:microsoft:.net::::::::* versions from (including) 8.0.0 up to (excluding) 8.0.29 cpe:2.3:a:microsoft:.net::::::::* versions from (including) 9.0.0 up to (excluding) 9.0.18 OR cpe:2.3:o:microsoft:windows:-:::::::* cpe:2.3:o:linux:linux_kernel:-:::::::* cpe:2.3:o:apple:macos:-:::::::*
Added	CPE Configuration	OR cpe:2.3:a:microsoft:visual_studio_2022::::::::* versions from (including) 17.12.0 up to (excluding) 17.12.22 cpe:2.3:a:microsoft:visual_studio_2022::::::::* versions from (including) 17.14.0 up to (excluding) 17.14.36 cpe:2.3:a:microsoft:visual_studio_2026::::::::* versions from (including) 18.7.0 up to (excluding) 18.7.4
Added	Reference Type	Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300 Types: Patch, Vendor Advisory

New CVE Received from Microsoft Corporation 7/14/2026 3:17:08 PM

Action	Type	New Value
Added	Description	Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
Added	CVSS V3.1	AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-303
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300
Added	Affected	[{"vendor":"Microsoft","product":".NET 10.0","versions":[{"version":"10.0.0","lessThan":"10.0.6","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 8.0","versions":[{"version":"8.0.0","lessThan":"8.0.29","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":".NET 9.0","versions":[{"version":"9.0.0","lessThan":"9.0.18","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.12","versions":[{"version":"17.12.0","lessThan":"17.12.22","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2022 version 17.14","versions":[{"version":"17.14.0","lessThan":"17.14.36","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft Visual Studio 2026 version 18.7","versions":[{"version":"18.0","lessThan":"18.7.4","versionType":"custom","status":"affected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-47300
NVD Published Date:
07/14/2026
NVD Last Modified:
07/22/2026
Source:
Microsoft Corporation

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Information Technology Laboratory

National Vulnerability Database