CVE-2026-78457: Windows Security Health Service Elevation of Privilege Vulnerability
Use after free in Windows Security Health Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Security Health 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 10.0.28000.2954Patch KB5124012 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9445Patch KB5124008
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The attacker must already be authorized on the affected system and exploit the flaw locally. The provided vector indicates low privileges are required; no user interaction is required.
What could a successful exploit allow?
A successful exploit could elevate the attacker’s privileges on the local system. The supplied impact metrics indicate potential high impact to confidentiality, integrity, and availability.
Which systems are identified as affected?
The listed affected software includes Microsoft Windows 11, Microsoft Windows Server 2025, and Microsoft Windows Server 2022.