CVE-2026-21521

HIGH
2026-01-22 [email protected]
7.4
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
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 7.4

Tags

Information Disclosure AI / ML 365 Word Copilot

Description

Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.

Analysis

Information disclosure in Microsoft 365 Word Copilot enables unauthenticated attackers to extract sensitive data through improper handling of escape and control sequences in network communications. The vulnerability requires user interaction to trigger and affects the Copilot AI/ML service with a CVSS score of 7.4. …

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Remediation

Within 24 hours: Inventory all Copilot deployments and identify data sensitivity levels of connected systems. Within 7 days: Implement network segmentation to isolate Copilot instances and restrict outbound communications; disable Copilot features if non-critical to operations. …

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Priority Score

37
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +37
POC: 0

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CVE-2026-21521 vulnerability details – vuln.today
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