Information Disclosure Vulnerability in M365 Copilot by Microsoft
CVE-2026-24307

9.3CRITICAL

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Copilot
Vendor
CVE Published:
22 January 2026

What is CVE-2026-24307?

An improper validation of specific input types in M365 Copilot allows unauthorized attackers to disclose sensitive information over the network. This vulnerability highlights the importance of input validation in software development and underlines potential risks associated with inadequate security measures. Organizations utilizing M365 Copilot should implement precautionary measures to mitigate exposure and safeguard against possible information leaks.

Affected Version(s)

Microsoft 365 Copilot -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.