.NET Information Disclosure Vulnerability
Published September 8, 2026Updated September 8, 2026
Source data
Overview
Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.
Impact & technical details
Information Disclosure
What type of information could be disclosed by this vulnerability? Successful exploitation could disclose developer-time hot reload data, including application metadata, intermediate language updates, debugging information, method names, string literals, and file paths.
- CVSS base score
- 6.5 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- .NET 10.0 installed on Linux
- .NET 10.0 installed on Mac OS
- .NET 10.0 installed on Windows
- .NET 11.0 installed on Linux
- .NET 11.0 installed on Mac OS
- .NET 11.0 installed on Windows
- .NET 8.0 installed on Linux
- .NET 8.0 installed on Mac OS
Show all 14 affected products
- .NET 8.0 installed on Windows
- .NET 9.0 installed on Linux
- .NET 9.0 installed on Mac OS
- .NET 9.0 installed on Windows
- Microsoft Visual Studio 2022 version 17.14
- Microsoft Visual Studio 2026 version 18.9
Source guidance
Remediation
- Release Notes
At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.
GTP recommendation · Rule-based guidance
Recommended next step
Review affected Microsoft products and apply the applicable security updates through your organization's normal patch-management process. Confirm availability and prerequisites in the Microsoft advisory.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
- Microsoft Security Response Center (opens in a new tab)
- Microsoft security update · Release Notes (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update (opens in a new tab)
- Microsoft security update · 5126104 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5126105 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · Release Notes (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5126106 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.