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CVE-2026-63509: Microsoft Fabric Elevation of Privilege Vulnerability

criticalCVSS 9.9CVE-2026-63509
Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoftproduct: FabricPath traversalPrivilege escalation
What
Relative path traversal allows authorized attackers to elevate privileges.
Who is affected
Microsoft Fabric deployments with authorized user access are affected.
Urgency
Critical severity with CVSS 9.9 requires immediate remediation.
Action
Apply available Microsoft security updates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.9
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63509

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-63509coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft Fabric Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center