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Microsoft 365 Copilot CVE-2026-42827

| EUVD-2026-31513 MEDIUM
Command Injection (CWE-77)
2026-05-22 microsoft GHSA-3x26-xpc6-wm74
6.5
CVSS 3.1
Temporal: 5.7
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CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
May 22, 2026 - 22:50 vuln.today

DescriptionNVD

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

AnalysisAI

Command injection in Microsoft 365 Copilot exposes sensitive information to unauthenticated remote attackers when a victim user interacts with attacker-controlled content, resulting in High confidentiality impact with no integrity or availability effect. The vulnerability carries a CVSS 6.5 (Medium) score, reflecting network accessibility and low attack complexity offset by a mandatory user interaction requirement. …

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CVE-2026-42827 vulnerability details – vuln.today

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