CVE-2026-78501

HIGH CVSS 3.1: 7.4 EPSS 0.49%
Updated Sep 18, 2026
Microsoft
Parameter Value
CVSS 7.4 (HIGH)
Affected Versions from -
Type CWE-77 (Command Injection), CWE-923
Vendor Microsoft
Public PoC No

Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Microsoft 365_Copilot_Business_Chat
cpe:2.3:a:microsoft:365_copilot_business_chat:*:*:*:*:*:*:*:*
-