What is CVE-2026-70178?

CVE-2026-70178 is a high-severity vulnerability in Microsoft Fabric, classified under Missing Authorization. CVSS score: 8.5/10. Published 2026-09-03.

How severe is CVE-2026-70178?

High severity. CVSS v3 base score is 8.5 out of 10.

Auth bypass in Microsoft Fabric

CVE-2026-70178

Missing authorization in Microsoft Fabric allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Broken Access Control

Published 2026-09-03 · last modified 2026-09-08.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (49.3th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

Microsoft Fabric Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-70178?: CVE-2026-70178 is a high-severity vulnerability in Microsoft Fabric, classified under Missing Authorization. CVSS score: 8.5/10. Published 2026-09-03.
How severe is CVE-2026-70178?: High severity. CVSS v3 base score is 8.5 out of 10.