CVE-2026-63509
Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.
CSIRTS triage
- 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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Exploitation outlook
- Low exploitation risk0.62% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-63509: Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privilege…nvd · 2026-08-20
- criticalCVE-2026-63509: Microsoft Fabric Elevation of Privilege Vulnerabilitymsrc · 2026-08-11
External references
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[](https://www.csirts.com/cve/CVE-2026-63509)