CVE-2026-24307
CRITICAL
2026-01-22
[email protected]
9.3
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: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
Description
Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Analysis
M365 Copilot has an input validation vulnerability allowing unauthorized attackers to extract sensitive information through crafted prompts over the network.
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Remediation
Within 24 hours: Audit M365 Copilot access logs and user activity for suspicious queries or data exfiltration patterns; escalate to incident response if compromise is suspected. Within 7 days: Implement network segmentation to restrict Copilot access to essential users only; document all current Copilot users and use cases. …
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Priority Score
47
Low
Medium
High
Critical
KEV: 0
EPSS: +0.1
CVSS: +46
POC: 0
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External POC / Exploit Code
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Destination URL
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