CVE-2026-20860: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Other sources
Windows Ancillary Function Driver for WinSock 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 6.0.6003.23717Patch KB5073700 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.1.7601.28117Patch KB5073699 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.8783Patch KB5073722 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.7623Patch KB5074109 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.22968Patch KB5073696 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.32230Patch KB5073379 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.25868Patch KB5073698 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.7623Patch KB5074109 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.25398.2092Patch KB5073450 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.6491Patch KB5073455 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.6809Patch KB5073724 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.6809Patch KB5073724 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.4648Patch KB5073457 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.8276Patch KB5073723
Event History
Frequently Asked Questions
What is the severity of CVE-2026-20860?
CVE-2026-20860 is classified as an elevation of privilege vulnerability.
How do I fix CVE-2026-20860?
To fix CVE-2026-20860, apply the Microsoft security updates available for affected Windows products.
Which products are affected by CVE-2026-20860?
CVE-2026-20860 affects various versions of Windows Server 2008, 2012, 2016, Windows 10, and Windows 11.
Can CVE-2026-20860 be exploited remotely?
CVE-2026-20860 requires local access for exploitation, meaning it cannot be exploited remotely.
What types of attacks can leverage CVE-2026-20860?
CVE-2026-20860 can be leveraged to perform local privilege escalation attacks by an authorized user.