CVE-2026-69563: Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
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Fixed in 10.0.28000.2954Patch KB5124012 - Upgrade
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Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
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Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.22631.7582Patch KB5122880 - Upgrade
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Fixed in 10.0.26200.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.19045.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.19044.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.17763.9245Patch KB5122876 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the affected Microsoft Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, Windows Server 2022, or Windows Server 2025 products are listed as affected. Exploitation is local, so exposure depends on an attacker already having authorized access to the system.
What level of access does an attacker need?
An attacker must be authorized and able to execute an attack locally. The vulnerability does not indicate a remote exploitation path or a requirement for user interaction.
What is the potential impact after successful exploitation?
Successful exploitation allows elevation of privilege. The provided severity vector indicates high impact to confidentiality, integrity, and availability.