Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.
Date: 2026-06
Affected: microsoft/365_copilot
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-47645
CWE: CWE-601
CVSS: 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

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


Mitigations:

Architectural layers (MAESTRO):