CVE-2026-20860

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

En bref

Sévérité: HIGH 7.8
EPSS: EPSS 8.28 % · centile 95 (2026-10-27)
État: PUBLISHED
Publiée: 2026-01-13
Mise à jour: 2026-07-30
Attribuée par: microsoft
Statut NVD: Analyzed

Description

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · secure@microsoft.com (Secondary)

Faiblesses (CWE)

CWE-843

Références européennes

ENISA EUVD · EUVD-2026-2159
GCVE · GCVE-0-2026-20860

Avis du CERT-FR

CERTFR-2026-AVI-0044 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* < 10.0.14393.8783
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* < 10.0.14393.8783
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* < 10.0.17763.8276
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* < 10.0.17763.8276
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* < 10.0.19044.6809
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* < 10.0.19045.6809
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* < 10.0.22631.6491
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* < 10.0.26100.7623
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* < 10.0.26200.7623
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* < 10.0.14393.8783
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* < 10.0.17763.8276
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* < 10.0.20348.4648
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* < 10.0.25398.2092
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* < 10.0.26100.32230

Produits affectés

Produit	Versions
Microsoft · Windows 10 Version 1607	affected 10.0.14393.0 < 10.0.14393.8783
Microsoft · Windows 10 Version 1809	affected 10.0.17763.0 < 10.0.17763.8276
Microsoft · Windows 10 Version 21H2	affected 10.0.19044.0 < 10.0.19044.6809
Microsoft · Windows 10 Version 22H2	affected 10.0.19045.0 < 10.0.19045.6809
Microsoft · Windows 11 version 23H2	affected 10.0.22631.0 < 10.0.22631.6491
Microsoft · Windows 11 Version 23H2	affected 10.0.22631.0 < 10.0.22631.6491
Microsoft · Windows 11 Version 24H2	affected 10.0.26100.0 < 10.0.26100.7623
Microsoft · Windows 11 Version 25H2	affected 10.0.26200.0 < 10.0.26200.7623
Microsoft · Windows Server 2008 R2 Service Pack 1	affected 6.1.7601.0 < 6.1.7601.28117
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)	affected 6.1.7601.0 < 6.1.7601.28117
Microsoft · Windows Server 2008 Service Pack 2	affected 6.0.6003.0 < 6.0.6003.23717
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)	affected 6.0.6003.0 < 6.0.6003.23717
Microsoft · Windows Server 2012	affected 6.2.9200.0 < 6.2.9200.25868
Microsoft · Windows Server 2012 (Server Core installation)	affected 6.2.9200.0 < 6.2.9200.25868
Microsoft · Windows Server 2012 R2	affected 6.3.9600.0 < 6.3.9600.22968
Microsoft · Windows Server 2012 R2 (Server Core installation)	affected 6.3.9600.0 < 6.3.9600.22968
Microsoft · Windows Server 2016	affected 10.0.14393.0 < 10.0.14393.8783
Microsoft · Windows Server 2016 (Server Core installation)	affected 10.0.14393.0 < 10.0.14393.8783
Microsoft · Windows Server 2019	affected 10.0.17763.0 < 10.0.17763.8276
Microsoft · Windows Server 2019 (Server Core installation)	affected 10.0.17763.0 < 10.0.17763.8276

Références

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20860

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD