Microsoft .NET Framework improper authorization

Summaryinfo

A vulnerability was found in Microsoft .NET Framework. It has been rated as critical. This affects an unknown part. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-62872. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Microsoft .NET Framework (version unknown). This issue affects an unknown function. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Incorrect authorization in .NET Framework allows an authorized attacker to elevate privileges over a network.

The advisory is shared at msrc.microsoft.com. The identification of this vulnerability is CVE-2026-62872 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 341336 (Microsoft .NET Framework (August 2026)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (341336) and CERT Bund (WID-SEC-2026-2761). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Microsoft PowerShell
• Red Hat Enterprise Linux
• Fedora Linux
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Microsoft Windows Server 2022
• Microsoft .NET Framework
• Microsoft Visual Studio Code
• Microsoft Windows Server 2012
• Microsoft Windows Server 2012 R2
• Microsoft Windows Server 2025
• RESF Rocky Linux
• Microsoft Windows
• Microsoft .NET
• Ubuntu Linux
• Oracle Linux
• Microsoft Visual Studio 2022
• Microsoft Visual Studio 2026

Productinfo

Type

• Programming Language Software

Vendor

• Microsoft

Name

• .NET Framework

License

• free

Website

• Vendor: https://www.microsoft.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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