Vulnerability Intelligence Report
M365 Copilot Information Disclosure Vulnerability
CVE-2026-54130
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:1.08%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-306 ↗CWE-306: Missing Authentication for Critical Function
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Microsoft 365 Copilot | - (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.084%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2026-06-11T20:33:37 |
| Published | 2026-06-18T21:42:39 |
| Patch Date | 2026-06-18 |
| Last Updated | 2026-09-24T13:43:32 |
Community Chatter & Buzz