Improper Input Validation in M365 Copilot Enables Data Disclosure

Publication date: 2026-01-22

Last updated on: 2026-02-12

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-22

Last Modified

2026-02-12

Generated

2026-07-06

AI Q&A

2026-01-23

EPSS Evaluated

2026-07-05

NVD

CVE-2026-24307

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_copilot	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1287	The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper validation of a specified type of input in Microsoft 365 Copilot, which allows an unauthorized attacker to disclose information over a network.

Impact Analysis

The vulnerability can lead to unauthorized disclosure of sensitive information over a network, potentially compromising confidentiality and leading to data breaches.

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