CVE-2026-87710: Microsoft Local Security Authority (LSA) Server Elevation of Privilege Vulnerability
Improper access control in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.
Other sources
Microsoft Local Security Authority (LSA) Server Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836
Event History
Frequently Asked Questions
What access and privileges does an attacker need to exploit this issue?
An attacker must already be authorized on the affected system and able to perform local actions with low privileges. Exploitation does not require user interaction, but has high attack complexity.
Which Windows products are identified as affected?
The affected software list includes Windows 10, Windows 11, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.
What could an attacker gain if exploitation succeeds?
Successful exploitation allows local privilege elevation through the Local Security Authority Server. The supplied severity vector indicates high potential impact to confidentiality, integrity, and availability.