Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-63509

CVE-2026-63509HIGH

Microsoft Fabric Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  H    8.8   .0102   62.3     —

AFFECTED
  Product           Versions  Fixed
  Microsoft Fabric  - –       —

TIMELINE
  Jul 16  Reserved by microsoft
  Aug 20  Published (CNA: microsoft)
  Sep 4   RESCORED — CVE-2026-63509 (Microsoft Fabric). CVSS 9.9 → 8.8 (NVD).

CWE-23 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 16, 2026	Reserved	Reserved by microsoft
August 20, 2026	Published	Published (CNA: microsoft)
September 4, 2026	RESCORED	RESCORED — CVE-2026-63509 (Microsoft Fabric). CVSS 9.9 → 8.8 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft Fabric	—	-	—

Weaknesses

CWE-23

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63509 [vendor-advisory, patch]

Authoritative record: CVE-2026-63509 at cve.org

Vendors: microsoft

Weaknesses: CWE-23

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-63509 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 Sunday, October 4, 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.