CVE-2026-83720

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Use After Free in Windows Kerberos Elevates Local Privileges

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

Use after free in Windows Kerberos allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-83720

EUVD

EUVD-2026-99965

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	11 version 26H1 10.0.28000.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability in Windows Kerberos. It allows an authorized attacker to elevate their privileges locally by exploiting a memory management flaw.

Detection Guidance

This vulnerability is a local privilege escalation in Windows Kerberos. Detection typically involves monitoring for unusual Kerberos authentication patterns or crashes. Check Windows Event Logs for Kerberos-related errors or application crashes. Use commands like 'wevtutil qe System /q:"*[System[(EventID=4768 or EventID=4769 or EventID=4771)]]" /f:text /c:50' to review Kerberos events.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Compliance Impact

This vulnerability allows local privilege escalation in Windows Kerberos, which could enable unauthorized access to sensitive systems or data. Such access may violate compliance requirements under GDPR (data protection) or HIPAA (healthcare data security) by exposing personal or protected health information.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Kerberos use-after-free vulnerability. Monitor Microsoft's update guide for the specific patch.

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