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365 Copilot CVE-2026-24307

CRITICAL
Improper Validation of Specified Type of Input (CWE-1287)
2026-01-22 secure@microsoft.com
9.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.3 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 22, 2026 - 23:15 nvd
CRITICAL 9.3

DescriptionCVE.org

Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.

AnalysisAI

M365 Copilot has an input validation vulnerability allowing unauthorized attackers to extract sensitive information through crafted prompts over the network.

Technical ContextAI

Microsoft 365 Copilot has a CWE-1287 improper validation of specified type of input that allows attackers to craft inputs that bypass safety controls and extract sensitive information from the AI assistant's context.

RemediationAI

Microsoft has released updates. Review Copilot access permissions and data classification policies.

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CVE-2026-24307 vulnerability details – vuln.today

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