CVE-2026-45487 - Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

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HIGH

Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

Published Jun 9, 2026

7.8

HIGH

CVSS 3.1

EPSS 0.21%

Description

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

Affected products

Vendor Microsoft Product Windows 10 Version 21H2 Default
n/a
- Version
  10.0.19044.0
  Status
  affected
  Constraints
  <10.0.19044.7417
Vendor Microsoft Product Windows 10 Version 22H2 Default
n/a
- Version
  10.0.19045.0
  Status
  affected
  Constraints
  <10.0.19045.7417
Vendor Microsoft Product Windows 11 Version 23H2 Default
n/a
- Version
  10.0.22631.0
  Status
  affected
  Constraints
  <10.0.22631.7219
Vendor Microsoft Product Windows 11 Version 24H2 Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.8655
Vendor Microsoft Product Windows 11 Version 25H2 Default
n/a
- Version
  10.0.26200.0
  Status
  affected
  Constraints
  <10.0.26200.8655
Vendor Microsoft Product Windows 11 version 23H2 Default
n/a
- Version
  10.0.22631.0
  Status
  affected
  Constraints
  <10.0.22631.7219
Vendor Microsoft Product Windows 11 version 26H1 Default
n/a
- Version
  10.0.28000.0
  Status
  affected
  Constraints
  <10.0.28000.2269
Vendor Microsoft Product Windows Server 2022 Default
n/a
- Version
  10.0.20348.0
  Status
  affected
  Constraints
  <10.0.20348.5256
Vendor Microsoft Product Windows Server 2025 Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.32995
Vendor Microsoft Product Windows Server 2025 (Server Core installation) Default
n/a
- Version
  10.0.26100.0
  Status
  affected
  Constraints
  <10.0.26100.32995

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Microsoft

Windows 10 Version 21H2

n/a

Version	Status	Constraints
10.0.19044.0	affected	<10.0.19044.7417

Microsoft

Windows 10 Version 22H2

n/a

Version	Status	Constraints
10.0.19045.0	affected	<10.0.19045.7417

Microsoft

Windows 11 Version 23H2

n/a

Version	Status	Constraints
10.0.22631.0	affected	<10.0.22631.7219

Microsoft

Windows 11 Version 24H2

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.8655

Microsoft

Windows 11 Version 25H2

n/a

Version	Status	Constraints
10.0.26200.0	affected	<10.0.26200.8655

Microsoft

Windows 11 version 23H2

n/a

Version	Status	Constraints
10.0.22631.0	affected	<10.0.22631.7219

Microsoft

Windows 11 version 26H1

n/a

Version	Status	Constraints
10.0.28000.0	affected	<10.0.28000.2269

Microsoft

Windows Server 2022

n/a

Version	Status	Constraints
10.0.20348.0	affected	<10.0.20348.5256

Microsoft

Windows Server 2025

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.32995

Microsoft

Windows Server 2025 (Server Core installation)

n/a

Version	Status	Constraints
10.0.26100.0	affected	<10.0.26100.32995

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-367

References (2)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-35673
Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45487
vendor-advisorypatchVendor Advisory

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-35673		Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45487		vendor-advisorypatchVendor Advisory