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

CVE-2026-96951

CVE-2026-96951HIGH

Microsoft Outlook.com — Windows Shell 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   .0151   74.1   YES

AFFECTED
  Product                  Versions        Fixed
  Outlook.com              1.0.0 –         —
  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 11 version 26H1  10.0.28000.0 –  —
  + 10 more

TIMELINE
  Sep 23  Reserved by microsoft
  Oct 13  ADDED TO KEV — CVE-2026-96951 (Microsoft Outlook.com). Remediation due October 16, 2026.
  Oct 13  Published (CNA: microsoft)
  Oct 17  DUE DATE PASSED — CVE-2026-96951 (Microsoft Outlook.com). CISA remediation deadline was October 16, 2026; still in catalog.

CWE-77 · CNA: microsoft · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due October 16, 2026

Description

Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
September 23, 2026	Reserved	Reserved by microsoft
October 13, 2026	KEV ADDED	ADDED TO KEV — CVE-2026-96951 (Microsoft Outlook.com). Remediation due October 16, 2026.
October 13, 2026	Published	Published (CNA: microsoft)
October 17, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2026-96951 (Microsoft Outlook.com). CISA remediation deadline was October 16, 2026; still in catalog.

Affected

Affected products and packages — 20 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Outlook.com	—	1.0.0	—
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 11 version 26H1	—	10.0.28000.0	—
Microsoft	Windows 11 Version 26H2	—	10.0.26300.0	—
Microsoft	Windows Server 2012 R2	—	6.3.9600.0	—
Microsoft	Windows Server 2012 R2 (Server Core installation)	—	6.3.9600.0	—
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 2025	—	10.0.26100.0	—
Microsoft	Windows Server 2025 (Server Core installation)	—	10.0.26100.0	—

Weaknesses

CWE-77

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96951 [Patch, Vendor Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96951 [US Government Resource]

Authoritative record: CVE-2026-96951 at cve.org

Vendors: microsoft

Weaknesses: CWE-77

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-96951 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 Monday, October 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.