Microsoft .NET/Visual Studio improper authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Microsoft .NET and Visual Studio. Affected by this issue is some unknown functionality. Executing a manipulation can lead to improper authorization. This vulnerability is tracked as CVE-2026-62899. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Microsoft .NET and Visual Studio (affected version not known) and classified as critical. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

The advisory is available at msrc.microsoft.com. This vulnerability was named CVE-2026-62899 since 07/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/20/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 335252 (RHEL 8 : .NET 10.0 (RHSA-2026:54542)), 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 (335252) and CERT Bund (WID-SEC-2026-2761). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 335252
Nessus Name: RHEL 8 : .NET 10.0 (RHSA-2026:54542)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/14/2026 CVE reserved
08/11/2026 +28 days Advisory disclosed
08/11/2026 +0 days VulDB entry created
08/20/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-62899 (🔒)
GCVE (CVE): GCVE-0-2026-62899
GCVE (VulDB): GCVE-100-388642
CERT Bund: WID-SEC-2026-2761 - Microsoft Developer Tools: Mehrere Schwachstellen

Entryinfo

Created: 08/11/2026 23:04
Updated: 08/20/2026 05:51
Changes: 08/11/2026 23:04 (52), 08/14/2026 06:57 (2), 08/15/2026 02:18 (7), 08/20/2026 05:51 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

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