Windows Error Reporting TOCTOU Race Condition Leads to Privilege Escalation

Executive Summary

This is a time-of-check time-of-use (TOCTOU) race condition in Windows Error Reporting. It allows an authorized attacker to exploit timing differences in privilege checks to elevate their privileges locally on affected systems.

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Detection Guidance

This vulnerability is a TOCTOU race condition in Windows Error Reporting. Detection typically requires analyzing system behavior for privilege escalation attempts during error reporting. Use Windows Event Viewer to check for unusual privilege-related events in Security logs. Monitor for unexpected changes in system32 directory permissions or unauthorized process creation after error events.

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Impact Analysis

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

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Compliance Impact

This vulnerability allows local privilege escalation through a race condition in Windows Error Reporting. While not directly impacting GDPR or HIPAA compliance, unauthorized privilege escalation could lead to unauthorized access to sensitive data, potentially violating confidentiality requirements in both regulations.

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Mitigation Strategies

Apply the latest Windows updates from Microsoft Update to patch the Windows Error Reporting component. Monitor Microsoft's security advisories for patches specific to CVE-2026-83750.

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