CVE-2026-26129
Modified Modified - Updated After Analysis

Information Disclosure in Microsoft 365 Copilot

Publication date: 2026-05-07

Last updated on: 2026-06-01

Assigner: Microsoft Corporation

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

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Meta Information

Published
2026-05-07
Last Modified
2026-06-01
Generated
2026-07-09
AI Q&A
2026-05-08
EPSS Evaluated
2026-07-08
NVD
CVE-2026-26129
EUVD
EUVD-2026-28445

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft 365_copilot_chat *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-138 The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as control elements or syntactic markers when they are sent to a downstream component.

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Executive Summary

This vulnerability involves improper neutralization of special elements in Microsoft 365 Copilot. It 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 exposing confidential data to attackers without requiring any user interaction or privileges.

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