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-2026-56155HIGH
Microsoft Windows 10 Version 1607 — Active Directory Federation Services Elevation of Privilege Vulnerability
  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .0233   82.2   YES
AFFECTED
  Product                                            Versions        Fixed
  Windows 10 Version 1607                            10.0.14393.0 –  —
  Windows 10 Version 1809                            10.0.17763.0 –  —
  Windows Server 2012                                6.2.9200.0 –    —
  Windows Server 2012 (Server Core installation)     6.2.9200.0 –    —
  Windows Server 2012 R2                             6.3.9600.0 –    —
  Windows Server 2012 R2 (Server Core installation)  6.3.9600.0 –    —
  Windows Server 2016                                10.0.14393.0 –  —
  Windows Server 2016 (Server Core installation)     10.0.14393.0 –  —
  Windows Server 2019                                10.0.17763.0 –  —
  Windows Server 2019 (Server Core installation)     10.0.17763.0 –  —
  + 3 more
TIMELINE
  Jun 19  Reserved by microsoft
  Jul 14  Added to CISA KEV, remediation due 2026-07-28
  Jul 14  Published (CNA: microsoft)
  Jul 29  DUE DATE PASSED — CVE-2026-56155 (Microsoft Windows 10 Version 1607). CISA remediation deadline was July 28, 2026; still in catalog.
CWE-1220 · CNA: microsoft · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due July 28, 2026

Description

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

Lifecycle

Complete event history — 4 events, chronological
DateEventDetail
June 19, 2026ReservedReserved by microsoft
July 14, 2026KEV ADDEDAdded to CISA KEV, remediation due 2026-07-28
July 14, 2026PublishedPublished (CNA: microsoft)
July 29, 2026DUE DATE PASSEDDUE DATE PASSED — CVE-2026-56155 (Microsoft Windows 10 Version 1607). CISA remediation deadline was July 28, 2026; still in catalog.

Affected

Affected products and packages — 13 rows
VendorProduct / PackageEcosystemVersion introducedFixed
MicrosoftWindows 10 Version 1607—10.0.14393.0—
MicrosoftWindows 10 Version 1809—10.0.17763.0—
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 2025—10.0.26100.0—
MicrosoftWindows Server 2025 (Server Core installation)—10.0.26100.0—

Weaknesses

CWE-1220

References (2)

Related

Authoritative record: CVE-2026-56155 at cve.org

Vendors: microsoft

Weaknesses: CWE-1220

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-56155 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.