CVE-2026-54130
CRITICALM365 Copilot Information Disclosure Vulnerability
Title source: cnaDescription
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
M365 Copilot Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54130
Scores
CVSS v3
9.8
EPSS
0.0058
EPSS Percentile
43.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-306
Status
published
Products (2)
microsoft/365_copilot
Microsoft/Microsoft 365 Copilot
-
Published
Jun 18, 2026
Tracked Since
Jun 19, 2026