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Privacy Statement Third-Party Cookies Accept Reject Manage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-35433 .NET Elevation of Privilege Vulnerability New On this page  CVE-2026-35433  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: May 12, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-35433  Impact Elevation of Privilege Max Severity Important Weakness CWE-20: Improper Input Validation CWE-190: Integer Overflow or Wraparound CVSS Source Microsoft Vector String CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C Metrics CVSS:3.1 7.3 / 6.4  Base score metrics: 7.3 / Temporal score metrics: 6.4  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Local Attack Complexity Low Privileges Required None User Interaction Required Scope Unchanged Confidentiality High Integrity High Availability Low   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Improper input validation in .NET allows an unauthorized attacker to elevate privileges locally. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Unlikely FAQ What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges. According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? Exploitation of this vulnerability requires that a user trigger the payload in the application. According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), and integrity (I:H), and some loss of availability (A:L). What does that mean for this vulnerability? An attacker who successfully exploited this vulnerability could view sensitive information (Confidentiality) and modify code in the repo, (Integrity), and they might be able to interfere with availability of the code (Availability). Acknowledgements Ky0toFu Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Customer Action Required Title: Release date, Content: May 12, 2026 .NET 9.0 installed on Windows - Elevation of Privilege Important Title: Knowledge Base Articles for .NET 9.0 installed on Windows, Content:, 1 link 5093448  Title: Download Security Update for .NET 9.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 9.0.16 Title: Assigning CNA, Content: Microsoft Title: Customer action required, Content: Required Title: Release date, Content: May 12, 2026 .NET 8.0 installed on Windows - Elevation of Privilege Important Title: Knowledge Base Articles for .NET 8.0 installed on Windows, Content:, 1 link 5093447  Title: Download Security Update for .NET 8.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 8.0.27 Title: Assigning CNA, Content: Microsoft Title: Customer action required, Content: Required Title: Release date, Content: May 12, 2026 .NET 10.0 installed on Windows - Elevation of Privilege Important Title: Knowledge Base Articles for .NET 10.0 installed on Windows, Content:, 1 link 5093446  Title: Download Security Update for .NET 10.0 installed on Windows, Content:, 1 link Security Update  Title: Build numbers, Content: 10.0.8 Title: Assigning CNA, Content: Microsoft Title: Customer action required, Content: Required All results loaded Loaded all 3 rows Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions version revisionDate description 1.0 May 12, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy