CVE-2026-20826 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-20826HIGH

Microsoft Windows 10 Version 1607 — Tablet Windows User Interface (TWINUI) Subsystem Information Disclosure Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   H   L   N  U  H  H  H    7.0   .0031   23.3     —

AFFECTED
  Product                                         Versions        Fixed
  Windows 10 Version 1607                         10.0.14393.0 –  —
  Windows 10 Version 1809                         10.0.17763.0 –  —
  Windows 10 Version 21H2                         10.0.19044.0 –  —
  Windows 10 Version 22H2                         10.0.19045.0 –  —
  Windows 11 version 23H2                         10.0.22631.0 –  —
  Windows 11 Version 23H2                         10.0.22631.0 –  —
  Windows 11 Version 24H2                         10.0.26100.0 –  —
  Windows 11 Version 25H2                         10.0.26200.0 –  —
  Windows Server 2016                             10.0.14393.0 –  —
  Windows Server 2016 (Server Core installation)  10.0.14393.0 –  —
  + 6 more

TIMELINE
  Dec 3   Reserved by microsoft
  Jan 13  Published (CNA: microsoft)
  Jul 30  RESCORED — CVE-2026-20826 (Microsoft Windows 10 Version 1607). CVSS 7.8 → 7 (NVD).

CWE-362 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Tablet Windows User Interface (TWINUI) Subsystem allows an authorized attacker to elevate privileges locally.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 3, 2025	Reserved	Reserved by microsoft
January 13, 2026	Published	Published (CNA: microsoft)
July 30, 2026	RESCORED	RESCORED — CVE-2026-20826 (Microsoft Windows 10 Version 1607). CVSS 7.8 → 7 (NVD).

Affected

Affected products and packages — 16 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1607	—	10.0.14393.0	—
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 21H2	—	10.0.19044.0	—
Microsoft	Windows 10 Version 22H2	—	10.0.19045.0	—
Microsoft	Windows 11 version 23H2	—	10.0.22631.0	—
Microsoft	Windows 11 Version 23H2	—	10.0.22631.0	—
Microsoft	Windows 11 Version 24H2	—	10.0.26100.0	—
Microsoft	Windows 11 Version 25H2	—	10.0.26200.0	—
Microsoft	Windows Server 2016	—	10.0.14393.0	—
Microsoft	Windows Server 2016 (Server Core installation)	—	10.0.14393.0	—
Microsoft	Windows Server 2019	—	10.0.17763.0	—
Microsoft	Windows Server 2019 (Server Core installation)	—	10.0.17763.0	—
Microsoft	Windows Server 2022	—	10.0.20348.0	—
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	—	10.0.25398.0	—
Microsoft	Windows Server 2025	—	10.0.26100.0	—
Microsoft	Windows Server 2025 (Server Core installation)	—	10.0.26100.0	—

Weaknesses

CWE-362

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20826 [Vendor Advisory]

Authoritative record: CVE-2026-20826 at cve.org

Vendors: microsoft

Weaknesses: CWE-362

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-20826 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.