Open Redirect Vulnerability in Microsoft 365 Copilot Business Chat

Publication date: 2026-06-19

Last updated on: 2026-06-26

Assigner: Microsoft Corporation

Description

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-19

Last Modified

2026-06-26

Generated

2026-07-11

AI Q&A

2026-06-20

EPSS Evaluated

2026-07-10

NVD

CVE-2026-47645

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_copilot	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-601	The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Attack-Flow Graph

Executive Summary

This vulnerability is an open redirect issue in Microsoft 365 Copilot's Business Chat feature. It allows an unauthorized attacker to redirect users to untrusted sites, which can be exploited to elevate privileges over a network.

Impact Analysis

The vulnerability can lead to privilege escalation over a network, potentially allowing attackers to gain higher access rights than intended. This can result in unauthorized actions, data compromise, or further exploitation within the affected environment.

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