CVE-2026-45487
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Program Compatibility Assistant Service TOCTOU Race Condition

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-45487
EUVD
EUVD-2026-35673
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft program_compatibility_assistant_service *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
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Executive Summary

This vulnerability is a time-of-check time-of-use (TOCTOU) race condition found in the Program Compatibility Assistant Service. It allows an authorized attacker to exploit a timing issue between checking a condition and using a resource, which can lead to unintended behavior.

Specifically, this flaw enables the attacker to elevate their privileges locally on the affected system.

Impact Analysis

The vulnerability can impact you by allowing an authorized local attacker to elevate their privileges. This means the attacker could gain higher-level access rights than intended, potentially leading to unauthorized actions such as installing software, accessing sensitive data, or modifying system settings.

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