Integer Underflow in Windows File History Service Leads to Privilege Escalation

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Integer underflow (wrap or wraparound) in Windows File History Service allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-72947

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	file_history_service	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer underflow issue in the Windows File History Service. An authorized attacker can exploit it to cause a wraparound effect, which may allow them to elevate their privileges locally on the system.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges, potentially allowing them to execute arbitrary code, install programs, or access sensitive data on your system.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows File History Service vulnerability. Disable the File History Service if not needed and restrict local user permissions to reduce attack surface.

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