boxscore/security
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-2026-21513HIGH
Microsoft Windows 10 Version 1607 — MSHTML Framework Security Feature Bypass Vulnerability
  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .1538   96.5   YES
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 22H3  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 11 version 26H1  10.0.28000.0 –  —
  Windows 11 Version 26H1  10.0.28000.0 –  —
  + 12 more
TIMELINE
  Dec 30  Reserved by microsoft
  Feb 10  Added to CISA KEV, remediation due 2026-03-03
  Feb 10  Published (CNA: microsoft)
CWE-693 · CNA: microsoft · CVSS v3.1 · 4 references · KEV due March 3, 2026

Description

Protection mechanism failure in MSHTML Framework allows an unauthorized attacker to bypass a security feature over a network.

Lifecycle

Complete event history — 3 events, chronological
DateEventDetail
December 30, 2025ReservedReserved by microsoft
February 10, 2026KEV ADDEDAdded to CISA KEV, remediation due 2026-03-03
February 10, 2026PublishedPublished (CNA: microsoft)

Affected

Affected products and packages — 22 rows
VendorProduct / PackageEcosystemVersion introducedFixed
MicrosoftWindows 10 Version 1607—10.0.14393.0—
MicrosoftWindows 10 Version 1809—10.0.17763.0—
MicrosoftWindows 10 Version 21H2—10.0.19044.0—
MicrosoftWindows 10 Version 22H2—10.0.19045.0—
MicrosoftWindows 11 version 22H3—10.0.22631.0—
MicrosoftWindows 11 Version 23H2—10.0.22631.0—
MicrosoftWindows 11 Version 24H2—10.0.26100.0—
MicrosoftWindows 11 Version 25H2—10.0.26200.0—
MicrosoftWindows 11 version 26H1—10.0.28000.0—
MicrosoftWindows 11 Version 26H1—10.0.28000.0—
MicrosoftWindows Server 2012—6.2.9200.0—
MicrosoftWindows Server 2012 (Server Core installation)—6.2.9200.0—
MicrosoftWindows Server 2012 R2—6.3.9600.0—
MicrosoftWindows Server 2012 R2 (Server Core installation)—6.3.9600.0—
MicrosoftWindows Server 2016—10.0.14393.0—
MicrosoftWindows Server 2016 (Server Core installation)—10.0.14393.0—
MicrosoftWindows Server 2019—10.0.17763.0—
MicrosoftWindows Server 2019 (Server Core installation)—10.0.17763.0—
MicrosoftWindows Server 2022—10.0.20348.0—
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)—10.0.25398.0—
MicrosoftWindows Server 2025—10.0.26100.0—
MicrosoftWindows Server 2025 (Server Core installation)—10.0.26100.0—

Weaknesses

CWE-693

References (4)

Related

Authoritative record: CVE-2026-21513 at cve.org

Vendors: microsoft

Weaknesses: CWE-693

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-21513 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.