Vulnerability Description
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.8783 |
| Microsoft | Windows 10 1809 | < 10.0.17763.8276 |
| Microsoft | Windows 10 21H2 | < 10.0.19044.6809 |
| Microsoft | Windows 10 22H2 | < 10.0.19045.6809 |
| Microsoft | Windows 11 23H2 | < 10.0.22631.6491 |
| Microsoft | Windows 11 24H2 | < 10.0.26100.7623 |
| Microsoft | Windows 11 25H2 | < 10.0.26200.7623 |
| Microsoft | Windows Server 2008 | - |
| Microsoft | Windows Server 2012 | - |
| Microsoft | Windows Server 2016 | < 10.0.14393.8783 |
| Microsoft | Windows Server 2019 | < 10.0.17763.8276 |
| Microsoft | Windows Server 2022 | < 10.0.20348.4648 |
| Microsoft | Windows Server 2022 23H2 | < 10.0.25398.2092 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32230 |
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-20860?
CVE-2026-20860 is a vulnerability with a CVSS score of 7.8 (HIGH). Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-20860?
CVE-2026-20860 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-20860?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 23H2.