What is CVE-2026-20848?

CVE-2026-20848 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows SMB Server Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-20848 cover?

CVE-2026-20848 covers the following CVE IDs: CVE-2026-20848. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-20848?

CVE-2026-20848 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-20848?

CVE-2026-20848 affects 29 products, including: Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows 10 Version 21H2 for 32-bit Systems; and others — see the full list on the advisory page.

CVE-2026-20848HighCVSS 7.5

Windows SMB Server Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-20848 →

📋 Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

🎯 Affected products29

Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5073723 (Security Update) — fixed build 10.0.17763.8276 KB5073457 (Security Update) — fixed build 10.0.20348.4648 KB5073724 (Security Update) — fixed build 10.0.19044.6809 KB5073724 (Security Update) — fixed build 10.0.19045.6809 KB5073379 (Security Update) — fixed build 10.0.26100.32230 KB5074109 (Security Update) — fixed build 10.0.26200.7623 KB5073455 (Security Update) — fixed build 10.0.22631.6491 KB5073450 (Security Update) — fixed build 10.0.25398.2092 KB5074109 (Security Update) — fixed build 10.0.26100.7623 KB5073722 (Security Update) — fixed build 10.0.14393.8783 KB5073698 (Monthly Rollup) — fixed build 6.2.9200.25868 KB5073696 (Monthly Rollup) — fixed build 6.3.9600.22968

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products29

✅ Remediation

🔗 References (22)