High severity · published Jun 19, 2026
CVE-2026-47645
Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
8.8
CVSS
0.8%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
M3
Microsoft 365 Copilot · Microsoft
All versions, or not specified · source: vendor
3C
365 Copilot · Microsoft
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47645
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47645
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47645
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