CVE-2026-21520

HIGH
2026-01-22 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 22, 2026 - 23:15 nvd
HIGH 7.5

Tags

Command Injection AI / ML Copilot Studio

Description

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

Analysis

Unauthenticated attackers can remotely access sensitive information in Microsoft Copilot Studio due to improper access controls, requiring no authentication or user interaction. This network-based vulnerability exposes confidential data to unauthorized disclosure with no patch currently available.

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Remediation

Within 24 hours: Audit access logs for Copilot Studio to identify potential unauthorized access; document all sensitive data stored in the platform. Within 7 days: Implement network segmentation to restrict Copilot Studio access to authorized users only; disable public or unauthenticated access if possible. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-21520 vulnerability details – vuln.today
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