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critical · CVSS v3 10

CVE-2026-69843

CVE‑2026‑69843 is a critical authentication bypass in Microsoft Fabric that lets an attacker spoof credentials and gain elevated privileges

Overview

CVE‑2026‑69843 is a critical authentication bypass in Microsoft Fabric that lets an attacker spoof credentials and gain elevated privileges across the network. The flaw allows unauthorized users to impersonate legitimate accounts, potentially accessing sensitive data and services. It is a high‑risk vulnerability that requires immediate attention from defenders.

Description

Authentication bypass by spoofing in Microsoft Fabric allows an unauthorized attacker to elevate privileges over a network.

Impact

The vulnerability permits attackers to bypass authentication controls and elevate privileges, enabling them to access protected resources, modify data, or pivot to other systems within the network. Defenders should be aware that any compromised Fabric instance could become a launchpad for further lateral movement. The attack surface expands to all services that rely on Fabric for identity and access management.

Remediation

1. Apply the latest security update or patch released by Microsoft for Fabric. 2. Verify that all Fabric components are running the patched version. 3. Enforce multi‑factor authentication for all Fabric users. 4. Segment network zones to limit lateral movement from Fabric services. 5. Monitor authentication logs for unusual spoofing patterns and set alerts for repeated failed or successful logins from unexpected IP ranges.

Risk context

With a CVSS v3 score of 10.0 and classified as critical, this vulnerability poses an immediate threat. No EPSS data is available, but the severity indicates that attackers could exploit it with minimal effort. Defenders should treat this as a high‑priority issue and act promptly.

Affected products

  • Microsoft Fabric

Scores

Severity
critical
CVSS v2
10
CVSS v3
10
CVSS v4
—
EPSS
—

authentication-bypass privilege-escalation Microsoft-Fabric network-security spoofing critical patch

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