CVE-2026-54130

critical Microsoft
CVSS v3 Base Score
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.5%
Exploitation probability in 30 days
Top 61% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: June 18, 2026 (21 days ago)
Last Modified: June 25, 2026
Vendor: Microsoft
Source: NVD

Description

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CWE

CWE-306

Affected Products

microsoft 365 copilot

References

🔗 msrc.microsoft.com