CVE-2026-47303 — ASP.NET Core Elevation of Privilege Vulnerability

Executive Summary

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

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Jul 14 2026

Last Updated Jul 14 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

11 affected products

Product	KB Article	Severity	Impact	Restart Required
.NET 10.0 installed on Linux	`5104034 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 10.0 installed on Mac OS	`5104034 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Linux	`5104032 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Mac OS	`5104032 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 8.0 installed on Windows	`5104032 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Linux	`5104033 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Mac OS	`5104033 (Security Update)`	Important	Elevation of Privilege	Maybe
.NET 9.0 installed on Windows	`5104033 (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft Visual Studio 2022 version 17.12	`Release Notes (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft Visual Studio 2022 version 17.14	`Release Notes (Security Update)`	Important	Elevation of Privilege	Maybe
Microsoft Visual Studio 2026 version 18.7	`Release Notes (Security Update)`	Important	Elevation of Privilege	Maybe

Patches

4 patches

Article	Type	Restart
`5104034`	Security Update	Maybe
`5104032`	Security Update	Maybe
`5104033`	Security Update	Maybe
`Release Notes`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Pham Quang Minh

References

MSRC Advisory MITRE NVD