CVE-2026-47645

HIGH

Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

Title source: cna

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory patch

Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47645

Scores

CVSS v3 8.8

EPSS 0.0041

EPSS Percentile 32.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-601

Status published

Products (2)

microsoft/365_copilot

Microsoft/Microsoft 365 Copilot -

Published Jun 19, 2026

Tracked Since Jun 20, 2026