CVE-2026-63509 — CRITICAL (9.9)

Vulnerability Description

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

CVSS Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-23

References

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

FAQ

What is CVE-2026-63509?

CVE-2026-63509 is a vulnerability with a CVSS score of 9.9 (CRITICAL). Relative path traversal in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

How severe is CVE-2026-63509?

CVE-2026-63509 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-63509?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.