CVE-2026-45487

Analyzed Analyzed - Analysis Complete

Program Compatibility Assistant Service TOCTOU Race Condition

Publication date: 2026-06-09

Last updated on: 2026-06-11

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-09

Last Modified

2026-06-11

Generated

2026-06-30

AI Q&A

2026-06-10

EPSS Evaluated

2026-06-28

NVD

CVE-2026-45487

EUVD

EUVD-2026-35673

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7417 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7219 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7219 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8655 (exc)
microsoft	windows_11_24h2	to 10.0.26100.8655 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8655 (exc)
microsoft	windows_11_25h2	to 10.0.26200.8655 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2269 (exc)
microsoft	windows_server_2022	to 10.0.20348.5256 (exc)
microsoft	windows_server_2025	to 10.0.26100.32995 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Compliance Impact

This vulnerability allows an authorized attacker to elevate privileges locally through a TOCTOU race condition in the Program Compatibility Assistant Service.

Elevation of privileges can potentially lead to unauthorized access or modification of sensitive data, which may impact compliance with standards such as GDPR and HIPAA that require strict access controls and protection of personal or health information.

However, no specific information is provided about direct effects on compliance with these regulations.

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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