CVE-2026-45487

31

FAUCET Score

Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

First published: Jun 9, 2026Last modified: Jun 9, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 10.0.19044.7417CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*
		< 10.0.19044.7417CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:*
		< 10.0.19044.7417CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:*
		< 10.0.19045.7417CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*
		< 10.0.19045.7417CPE matchmatch criteria	cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

1.8

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.18%

Probability of exploitation in next 30 days

EPSS Percentile

8.3%

Percentile rank of EPSS score among Peer Group

As of 2026-07-28

Model: v2026.06.15

This CVE's current EPSS score of 0.0018 is in the 32nd percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (19)

microsoftpatch availablevia msrc

Product: Windows Server 2022Fixed in: 10.0.20348.5256

microsoftpatch availablevia msrc

Product: Windows Server 2022 (Server Core installation)Fixed in: 10.0.20348.5256

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for 32-bit SystemsFixed in: 10.0.19044.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for ARM64-based SystemsFixed in: 10.0.19044.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 21H2 for x64-based SystemsFixed in: 10.0.19044.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for x64-based SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for ARM64-based SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows 10 Version 22H2 for 32-bit SystemsFixed in: 10.0.19045.7417

microsoftpatch availablevia msrc

Product: Windows Server 2025 (Server Core installation)Fixed in: 10.0.26100.32995

microsoftpatch availablevia msrc

Product: Windows Server 2025Fixed in: 10.0.26100.32995

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for ARM64-based SystemsFixed in: 10.0.26200.8655

microsoftpatch availablevia msrc

Product: Windows 11 Version 25H2 for x64-based SystemsFixed in: 10.0.26200.8655

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for ARM64-based SystemsFixed in: 10.0.22631.7219

microsoftpatch availablevia msrc

Product: Windows 11 Version 23H2 for x64-based SystemsFixed in: 10.0.22631.7219

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for ARM64-based SystemsFixed in: 10.0.26100.8655

microsoftpatch availablevia msrc

Product: Windows 11 Version 24H2 for x64-based SystemsFixed in: 10.0.26100.8655

microsoftpatch availablevia msrc

Product: Windows 11 version 26H1 for x64-based SystemsFixed in: 10.0.28000.2269

microsoftpatch availablevia msrc

Product: Windows 11 Version 26H1 for ARM64-based SystemsFixed in: 10.0.28000.2269

microsoftvendor investigatingvia nvd_reference

Vendor Advisories (1)

microsoft2026-Jun/CVE-2026-45487Important

Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

References

msrc.microsoft.com / update-guide/vulnerability/CVE-2026-45487

Vendor Advisory