CVE-2026-47645

Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability

Published Jun 19, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft 365 Copilot
Weaknesses CWE-601
CPEs cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Copilot
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 11:25 PM
Reserved
May 19, 2026, 8:12 PM
Status
Analyzed
Published
Jun 19, 2026, 9:16 PM
Modified
Oct 25, 2026, 11:10 PM